Download ARPIT 2019 Astronomy And Astrophysics Creation Question Paper

Question Paper Name: Astronomy and Astrophysics

Subject Name: Astronomy and Astrophysics

Creation Date: 2019-03-30 20:10:05

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Duration: 180

Total Marks: 100

Display Marks: Yes

Astronomy and Astrophysics

Group Number: 1

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Group Id: 90958244

Group Maximum Duration: 0

Group Minimum Duration: 120

Revisit allowed for view?: No

Revisit allowed for edit?: No

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Break time: 0

Group Marks: 100

Astronomy and Astrophysics

Section Id: 90958244

Section Number: 1

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Section type: Online

Mandatory or Optional: Mandatory

Number of Questions: 100

Number of Questions to be attempted:

Section Marks: 100

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Display Number Panel: Yes

Group All Questions: No

Sub-Section Number: 1

Sub-Section Id: 90958246

Question Shuffling Allowed: Yes

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Question Number: 1 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

Which type of galaxy has very little dust and gas and consists mostly of old stars?

1. Elliptical
2. Spiral

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3. Barred Spiral
4. Irregular

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Question Number: 2 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

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The mass of the central supermassive black hole in a spiral galaxy strongly correlates with

1. the luminosity of the disk of the galaxy
2. the colour of the bulge of the galaxy
3. the colour of the disk of the galaxy
4. the luminosity of the bulge of the galaxy

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Options:

1. A
2. B
3. C
4. D

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Question Number: 3 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

The atmosphere is equivalent to how much mass in units of gm cm^-2 at Mumbai?

1. 1.0
2. 1033

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3. 13.6
4. 800

Options:

1. A
2. B

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3. C
4. D

Question Number: 4 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

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Question patterns in the Sun can be seen as flows in

1. Doppler grams
2. Magneto grams
3. EUV Imaging
4. X-ray imaging

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Options:

1. A
2. B
3. C
4. D

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Question Number: 5 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

In the Sun the regions of strong magnetic field appear brighter in EUV images. This shows

1. changing of characteristic plasma from absorption to emission
2. action of neutrinos

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3. coupling of the solar layers
4. coronal mass ejection

Options:

1. A
2. B

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3. C
4. D

Question Number: 6 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

Which of these features is associated with highest magnetic fields in Sun?

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1. apex of coronal loops
2. coronal holes
3. solar winds
4. the poles of the Sun

Options:

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1. A
2. B
3. C
4. D

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As per the general theory of relativity, gravitational waves are generated by time-varying

1. monopole
2. dipole
3. quadrupole
4. octupole

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Options:

1. A
2. B
3. C
4. D

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Question Number: 8 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

The gravitational wave travels at the speed of

1. sound
2. neutrinos

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3. electron
4. light

Options:

1. A
2. B

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3. C
4. D

Question Number: 9 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

If a gravitation wave passes through a set of test particles, the distance between the particles changes then the displacement strain is

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1. proportional to the amplitude of the radiation
2. proportional to the square of the amplitude of the radiation
3. does not depend on the incoming wave at all
4. zero

Options:

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1. A

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Question Number: 10 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

As per general theory of relativity, gravitational waves have

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1. one state of polarisation
2. six states of polarisation
3. no polarisation
4. two states of polarisation

Options:

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1. A
2. B
3. C
4. D

Question Number: 11 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

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Correct Marks: 1 Wrong Marks: 0

As per general theory of relativity, gravitational waves are

1. electromagnetic waves
2. longitudinal waves
3. transverse waves

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4. not related to the direction of propagation

Options:

1. A
2. B
3. C

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4. D

Question Number: 12 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

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To determine the passing gravitational wave through the space-time, one needs to

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1. monitor the position of a single test particle as a function of time
2. measure the proper distance between at least two test particles as a function of time
3. measure the proper distance between at least four test particles as a function of time
4. measure the distance to the source emitting radiation

Options:

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1. A
2. B
3. C
4. D

Question Number: 13 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

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Correct Marks: 1 Wrong Marks: 0

CCD detectors are better than photographic plates for astronomical imaging because

1. they have a larger field of view
2. they have a linear response to the amount of light incident
3. they do not require cooling

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4. they are inexpensive

Options:

1. A
2. B
3. C

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4. D

Question Number: 14 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

Vizier is

1. a repository of astronomical catalogues

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2. a tool for displaying images
3. a tool for plotting data in catalogues
4. a Python library for image analysis

Options:

1. A

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2. B
3. C

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Question Number: 15 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

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In astronomy, what is FITS?

1. A multivariate analysis tool
2. A library for optimised fitting to pulsar data
3. A software for displaying astronomical images
4. A standardised format for exchanging astronomical data

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Options:

1. A
2. B
3. C
4. D

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Question Number: 16 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

The Sloan Digital Sky Survey has obtained spectra for about

1. 10,000 quasars
2. 100,000 quasars

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3. 1 million quasars
4. 10 million quasars

Options:

1. A
2. B

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3. C
4. D

Question Number: 17 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

The synchrotron emission from a relativistic electron

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1. is equal in all directions
2. spread over 2p Ste radian in the forward hemisphere
3. concentrated in a narrow cone along the direction of motion
4. is along the magnetic field

Options:

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1. A
2. B

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Question Number: 18 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

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Which of the following discoveries of Galileo help proved that the heliocentric theory of planetary motion is correct?

1. Dark spots on the surface of the Sun
2. Stars in the Milky Way
3. The rings of Saturn
4. The phases of the planet Venus

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Options:

1. A
2. B
3. C
4. D

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Question Number: 19 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

If we need to obtain a resolution of 1 milliarcsecond at 1.4 GHz using an interferometer, then we need

1. antennas all across the world
2. antennas all over India

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3. antennas in space orbiting the earth
4. antennas on earth and the moon

Options:

1. A
2. B

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3. C
4. D

Question Number: 20 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

Nuclear Fusion inside a massive star (> 10 solar mass) stops after producing

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1. Iron peak elements
2. Helium
3. Carbon, Oxygen and Magnesium
4. Rare Earth elements

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Question Number: 21 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

In the interior of a neutron star, mixture of free protons and free neutrons are found

1. in the entire volume
2. in the core, above nuclear density

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3. in the inner crust and the core
4. in the inner core, at densities above 10¹⁸ kg m^-3

Options:

1. A
2. B

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3. C
4. D

Question Number: 22 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

For images with dense distributions of stars or star clusters, the brightness of stars are estimated using

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1. timing analysis
2. aperture photometry
3. PSF photometry
4. spectroscopy

Options:

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1. A
2. B
3. C
4. D

Question Number: 23 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

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Correct Marks: 1 Wrong Marks: 0

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ist reverberation technique of timing analysis,

1. light from accretion disk and dusty torus are compared
2. light from accretion disk and broad line regions are compared

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3. light from black-hole and dusty torus are compared
4. light from narrow line and broad line regions are compared

Options:

1. A
2. B

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3. C
4. D

Question Number: 24 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

Which of these is true for an adaptive optics system on a telescope?

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1. A narrower peak of the PSF is important for detecting a distant normal galaxy
2. A larger Strehl ratio is important for imaging the centre of a star cluster
3. A narrower peak of the PSF is important for detecting a planet that is far away from its parent star
4. A larger Strehl ratio is important for detecting a distant normal galaxy

Options:

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1. A
2. B
3. C
4. D

Question Number: 25 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

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Correct Marks: 1 Wrong Marks: 0

If the Fried parameter at 500 nm is 100 cm, then what is the best resolution obtainable with a large telescope without adaptive optics?

1. 10 arc second
2. 1 arc second
3. 0.1 arc second

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4. 0.01 arc second

Options:

1. A
2. B
3. C

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Question Number: 26 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

The typical density in space is 0.1 particles per cc and in the Earth's atmosphere is 1 × 10¹⁹ particles per cc. For a cylinder of cross section1cm², how long must the cylinder be in space to have the same number of particles as 1 cc of Earth's atmosphere?

1. 0.00106 light years

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2. 1.06 light years
3. 10600 light years
4. 106 light years

Options:

1. A

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2. B
3. C
4. D

Question Number: 27 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

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To compute the standard deviation the statistical average that is used is

1. mean
2. mode
3. median
4. both mode and median

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Options:

1. A
2. B
3. C
4. D

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Question Number: 28 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

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Friedman-Le Maitre-Robertson-Walker (FLRW) cosmology, the space-time geometry is described by the following line-element,

ds² = c²dt² - a²(t) [ dr²/(1-kr²) + r² (d?² + sin²?df²)], where a(t) is the scale-factor. It is given that ?/a > 0. Therefore, according to the FLRW model,

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1. all cosmic objects and structures in the universe must expand in size
2. unbound structures having size bigger than about 200-300 Mpc expand
3. structures and cosmic objects having size smaller than about 200 Mpc expand
4. structures and cosmic objects having size smaller than about 200 Mpc contract

Options:

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1. A
2. B
3. C
4. D

Question Number: 29 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

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Correct Marks: 1 Wrong Marks: 0

For the AGN unification scheme to work,

1. the torus should be transparent to optical photons
2. the torus should absorb the photons from the narrow-line emitting clouds
3. the torus should absorb the photons from the broad-line emitting clouds

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4. the torus should be opaque from radio up to gamma rays

Options:

1. A
2. B
3. C

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4. D

Question Number: 30 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

Among the following ISRO missions, the observatory meant for multiwavelength astronomy is

1. Chandrayaan-1

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2. Astrosat
3. Mars Orbiter Mission
4. Chandrayaan-2

Options:

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Question Number: 31 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

With reference to the electromagnetic spectrum, which one of the following statements is true?

1. Decreasing frequency is correlated to decreasing energy
2. An object emitting predominantly in the ultra-violet is cooler than red hot iron

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3. Increasing temperature is correlated to increasing wavelength
4. Ultra-violet emitters are at higher temperature than gamma-ray emitters

Options:

1. A
2. B

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3. C
4. D

Question Number: 32 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

A spectrum provides the properties of a photon as a function of

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1. position
2. time
3. polarisation
4. energy

Options:

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1. A
2. B
3. C
4. D

Question Number: 33 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

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Correct Marks: 1 Wrong Marks: 0

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ched filter q(t) is proportional to the signal h(t) (that is q(t) = Ah(t), where A is a constant) in

1. stationary noise
2. coloured noise

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3. white noise
4. this is never the case

Options:

1. A
2. B

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3. C
4. D

Question Number: 34 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

In Astrosat, the X-ray detector covering a large field of view for regular monitoring of the X-ray sky and discovering X-ray transients is

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1. SSM
2. UVIT
3. SXT
4. LAXPC

Options:

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1. A
2. B
3. C
4. D

Question Number: 35 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

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Correct Marks: 1 Wrong Marks: 0

With reference to our solar system, choose the correct statement

1. Sedna is the only trans-Neptunian object
2. Mercury and Ceres are dwarf planets
3. Uranus does not have any satellite

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4. Pluto is a trans-Neptunian object

Options:

1. A
2. B
3. C

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4. D

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Question Number: 36 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

Dark patches are seen in the plane of the Milky Way galaxy. These are most likely to be produced by

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1. blank parts of the galaxy where there are no stars
2. clouds of interstellar material that contain dust particles
3. supernova explosions that have pushed away nearby stars
4. black holes that bend light away from our line of sight

Options:

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1. A
2. B
3. C
4. D

Question Number: 37 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

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Correct Marks: 1 Wrong Marks: 0

The physical process that efficiently stops star formation of a galaxy moving swiftly in the core of a galaxy cluster is known as

1. galaxy harassment
2. strangulation
3. downsizing

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4. ram-pressure stripping

Options:

1. A
2. B
3. C

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4. D

Question Number: 38 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

Till what radial distance from the centre of the Sun, does the Sun rotate as a solid body? (R_sun = 6.95 × 10⁵ km)

1. ~2 × 10⁵ km

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2. ~ 10 × 10⁵ km
3. ~4.8 x 10⁵ km
4. ~ 6.95 × 10⁵ km

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Question Number: 39 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

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Correct Marks: 1 Wrong Marks: 0

The slope of the radio spectrum of a dead radio galaxy no longer powered by the central black hole steepens with time since

1. the rate of energy loss is higher for higher frequencies
2. the rate of energy loss is lower for higher frequencies
3. the loss due to Hubble expansion of the radio galaxy is higher for higher frequencies

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4. the loss due to Hubble expansion of the radio galaxy is lower for higher frequencies

Options:

1. A
2. B
3. C

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4. D

Question Number: 40 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 1 Wrong Marks: 0

The suitable place for a habitable planet in our Galaxy is

1. near the central bulge

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2. inside the spiral arms
3. at the edge of the Galaxy
4. within the gap between two spiral arms

Options:

1. A

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2. B
3. C
4. D

Sub-Section Number: 2

Sub-Section Id: 90958247

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Question Shuffling Allowed: Yes

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Question Number: 41 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

Correct Marks: 2 Wrong Marks: 0

A scalar field is expected to vanish on the infinite plane x = 0 in (3+1)-dimensional Minkowski spacetime. In such a case, the modes of the scalar field will depend on the x-coordinate as

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1. cos(k_x x)
2. sin(k_x x)
3. exp(-i k_x x)
4. exp(i k_x x)

Options:

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1. A
2. B
3. C
4. D

Question Number: 42 Question Type: MCQ Option Shuffling: No Display Question Number: Yes Single Line Question Option: No Option Orientation: Vertical

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Correct Marks: 2 Wrong Marks: 0

Consider a solar mass star orbiting the 4 x 10⁶ solar mass black hole at the centre of our Galaxy in a circular face-on orbit, once every 4 years. The radius of the orbit is

1. 4 x 10^-6 pc
2. 0.002 pc
3. 0.006 pc

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4. 2 pc

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