National Testing Agency
Question Paper Name : Stars And Stellar Systems 15th S
Subject Name : Stars and Stellar Systems
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Creation Date : 2020-09-15 13:26:32
Duration : 180
Total Marks : 100
Display Marks: Yes
Share Answer Key With Delivery Engine : Yes
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Actual Answer Key : Yes
Stars And Stellar Systems
Group Number : 1
Group Id : 89951420
Group Maximum Duration : 0
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Group Minimum Duration : 120
Show Attended Group? : No
Edit Attended Group? : No
Break time : 0
Group Marks : 100
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Is this Group for Examiner? : No
Stars And Stellar Systems
Section Id : 89951420
Section Number : 1
Section type : Online
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Mandatory or Optional : Mandatory
Number of Questions : 4
Number of Questions to be attempted : 4
Section Marks : 100
Display Number Panel : Yes
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Group All Questions : Yes
Mark As Answered Required? : Yes
Sub-Section Number : 1
Sub-Section Id : 89951430
Question Shuffling Allowed : Yes
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Question Id : 8995141596 Question Type : COMPREHENSION Sub Question Shuffling Allowed : Yes Gro : No
Question Numbers : (1 to 25)
Question Label : Comprehension
CONSTANTS AND CONVERSION FACTORS:
Speed of light c = 3 x 108ms-1
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Planck's constant h = 6.626 × 10-34J.s
Gravitational constant G = 6.674 × 10-11m3kg-1s-2
Mass of proton mp = 1.673 x 10-27 kg
Mass of electron me = 9.109 × 10-31kg
Stefan-Boltzmann constant s = 5.670 × 10-8Jm-2s-1K-4
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Boltzmann constant k = 1.381 × 10-23JK-1
Mass of Sun M? = 1.989 × 1030 kg
Luminosity of Sun L?= 3.83 × 1026 W
Radius of Sun R?= 6.96 × 108 m
Mass of Earth M? = 5.972 × 1024kg
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1eV = 1.602 x 10-19J
1pc = 3.26ly; 1pc = 3.086 × 1016m; 1ly = 9.461 × 1015m
1yr = 3.154 × 107s
Sub questions
Question Number : 1 Question Id : 8995141597 Question Type : MCQ Option Shuffling : No Display Quest
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Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
What are the progenitors of type-Ia supernovae?
A. 10-15 M?
B. 20-30 M?
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C. 2-3 M?
D. 100 M?
Options:
8995146360. 1
8995146361. 2
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8995146362. 3
8995146363. 4
Question Number : 2 Question Id : 8995141598 Question Type : MCQ Option Shuffling : No Display Quest
Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
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Primary elements produced during AGB evolution are
A. C, N, O and s-process
B. Fe-peak and Mg, Si
C. Mg, Si and r-process
D. Ca, Ti, Eu
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Options:
8995146364. 1
8995146365. 2
8995146366. 3
8995146367. 4
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Question Number : 3 Question Id : 8995141599 Question Type : MCQ Option Shuffling : No Display Quest
Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
What is Lithium plateau?
A. The constant Lithium abundances derived from cosmic baryon density based on CMB measurement
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B. Lithium observed in the interstellar medium
C. Lithium observed in metal poor halo dwarfs
D. Lithium that is made in cosmic ray spallation
Options:
8995146368. 1
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8995146369. 2
8995146370. 3
8995146371. 4
Question Number : 4 Question Id : 8995141600 Question Type : MCQ Option Shuffling : No Display Quest
Mandatory : No Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 1 Wrong Marks : 0
Typical mass of the Giant Molecular Cloud is
A. about 10 M?
B. about 100 M?
C. few 100 M?
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D. greater than 1000 M?
Options:
8995146372. 1
8995146373. 2
8995146374. 3
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8995146375. 4
Question Number : 5 Question Id : 8995141601 Question Type : MCQ Option Shuffling : No Display Quest
Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
Our Sun has already spent about ________ of its nuclear burning lifetime.
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A. 90%
B. 80%
C. 50%
D. 30%
Options:
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8995146376. 1
8995146377. 2
8995146378. 3
8995146379. 4
Question Number : 6 Question Id : 8995141602 Question Type : MCQ Option Shuffling : No Display Quest
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Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For an observer in Australia
A. north celestial pole is visible in the sky
B. south celestial pole is visible in the sky
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C. none of the celestial poles are visible in the sky
D. both the celestial poles are visible on opposite sides of the sky
Options:
8995146380. 1
8995146381. 2
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8995146382. 3
8995146383. 4
Question Number : 7 Question Id : 8995141603 Question Type : MCQ Option Shuffling : No Display Quest
Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
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The maximum mass possible for a white dwarf star is
A. 1.4 M?
B. 1.0 M?
C. 0.1 M?
D. 0.8 M?
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Options:
8995146384.1
Question Number : 8 Question Id : 8995141604 Question Type : MCQ Option Shuffling : No Display Quest
Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
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The stars Betelguese and Rigel are in the constellation of Orion. Betelguese appears red while Rigel appears bluish. This is because
A. Rigel is farther than Betelguese from us
B. Rigel is nearer than Betelguese from us
C. surface of Rigel is hotter than Betelguese
D. surface of Rigel is cooler than Betelguese
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Options:
8995146388. 1
8995146389. 2
8995146390. 3
8995146391. 4
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Question Number : 9 Question Id : 8995141605 Question Type : MCQ Option Shuffling : No Display Quest
Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
Limb darkening in the image of a stellar disc is due to
A. poor image quality at edges
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B. energy production throughout the star
C. line-of sight at edge intersects lower temperature regions unlike the centre
D. star-spots, similar to sunspots
Options:
8995146392. 1
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8995146393. 2
8995146394. 3
8995146395. 4
Question Number : 10 Question Id : 8995141606 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 1 Wrong Marks : 0
The intermediate element produced in triple alpha reaction is
A. Li
B. Be
C. B
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D. C
Options:
8995146396. 1
8995146397. 2
Question Number : 11 Question Id : 8995141607 Question Type : MCQ Option Shuffling : No Display Ques
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Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
Which of the following statements is not true about most brown dwarfs?
A. Effective temperatures lie between 900 and 3500 K
B. Very faint low luminosity objects
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C. They have strong winds
D. Some nuclear fusion occurs in their interiors
Options:
8995146400. 1
8995146401. 2
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8995146402. 3
8995146403. 4
Question Number : 12 Question Id : 8995141608 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
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gamma Doradus variable stars fall on the
A. main-sequence
B. horizontal branch
C. red-giant branch
D. asymptotic giant branch
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Options:
8995146404. 1
8995146405. 2
8995146406. 3
8995146407. 4
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Question Number : 13 Question Id : 8995141609 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
beta Cephei and SPB stars are located in the
A. Cepheid instability strip
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B. Delta Scuti instability strip
C. red-giant branch
D. main-sequence
Options:
8995146408. 1
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8995146409. 2
8995146410. 3
8995146411. 4
Question Number : 14 Question Id : 8995141610 Question Type : MCQ Option Shuffling : No Display Que
Mandatory : No Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 1 Wrong Marks : 0
Which variable stars help in constraining lower bound on the age of the Universe?
A. Type I Cepheids
B. Type II Cepheids
C. RR Lyrae variables
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D. Mira variables
Options:
8995146412. 1
8995146413. 2
8995146414. 3
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8995146415. 4
Question Number : 15 Question Id : 8995141611 Question Type : MCQ Option Shuffling : No Display Ques
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
The distance of the first Lagrange point from Earth is
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A. one hundredth of 1 AU
B. one tenth of 1 AU
C. one thousandth of 1 AU
D. same as 1 AU
Options:
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8995146416. 1
8995146417. 2
8995146418. 3
Question Number : 16 Question Id : 8995141612 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 1 Wrong Marks : 0
The optical emission from the Sun comes from the photosphere, while that seen at low radio frequencies arises in the
A. photosphere
B. chromosphere
C. transition layer
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D. corona
Options:
8995146420. 1
8995146421. 2
8995146422. 3
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8995146423. 4
Question Number : 17 Question Id : 8995141613 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 0
Question Number : 18 Question Id : 8995141614 Question Type : MCQ Option Shuffling : No Display Que
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Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
Is the current global warming completely due to the Sun's activity?
A. No
B. Maybe
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C. Yes
D. We do not have the understanding to answer this question
Options:
8995146424. 1
8995146425. 2
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8995146426. 3
8995146427. 4
Question Number : 19 Question Id : 8995141615 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
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What is the source of energy for powering solar storms and stellar flares?
A. Gravitational energy
B. Nuclear energy
C. Potential energy
D. Magnetic energy
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Options:
8995146428. 1
8995146429. 2
8995146430. 3
8995146431. 4
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Question Number : 20 Question Id : 8995141616 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 0
Question Number : 21 Question Id : 8995141617 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
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Correct Marks : 1 Wrong Marks : 0
The Alfven flux freezing condition
A. applies to high Reynolds number plasma
B. applies to situations where the conductivity of the plasma is very small
C. applies to situations where Alfven waves propagate
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D. applies to situations where the resistivity is high
Options:
8995146432. 1
8995146433. 2
8995146434. 3
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8995146435. 4
Question Number : 22 Question Id : 8995141618 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
In a neutron star, what is the density above which superfluid neutrons are expected to be found?
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A. 4 × 1011 g cm-3
B. 4 × 1012 g cm-3
C. 4 × 1013 g cm-3
D. 4 × 1014 g cm-3
Options:
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8995146436. 1
8995146437. 2
8995146438. 3
8995146439. 4
Question Number : 23 Question Id : 8995141619 Question Type : MCQ Option Shuffling : No Display Que
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Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
The value of a neutron star's magnetic field obtained from the accretion rate (B x M) gives an estimate of the
A. large scale dipolar field
B. dipolar field at Alfven radius
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C. total field strength at light cylinder
D. higher multipoles at the surface
Options:
8995146440. 1
Question Number : 24 Question Id : 8995141620 Question Type : MCQ Option Shuffling : No Display Que
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Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
A 1.4 M? neutron star is supported against gravity by
A. degeneracy pressure of neutrons alone
B. degeneracy pressure of neutrons combined with repulsive nuclear interaction
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C. repulsive nuclear interactions alone
D. degeneracy pressure of electrons
Options:
8995146444. 1
8995146445. 2
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8995146446. 3
8995146447. 4
Question Number : 25 Question Id : 8995141621 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
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The number of neutron stars in our Galaxy is estimated to be of order
A. 105
B. 107
C. 109
D. 1011
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Options:
8995146448. 1
8995146449. 2
8995146450. 3
8995146451. 4
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Question Number : 26 Question Id : 8995141622 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
For accreting hydrogen-rich matter, the energy generated by nuclear burning Enuc on the surface of a compact star compares with its gravitational binding energy Eg as
A. Eg > Enuc for both neutron star and white dwarf
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B. Eg< Enuc for both neutron star and white dwarf
C. Eg > Enuc for white dwarf and Eg < Enuc for neutron star
D. Eg < Enuc for white dwarf and Eg > Enuc for neutron star
Options:
8995146452. 1
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Question Number : 27 Question Id : 8995141623 Question Type : MCQ Option Shuffling : No Display Que
Question Mandatory : No Single Line Question Option : No Option Orientation : Vertical
Correct Marks : 1 Wrong Marks : 0
What is stellar inclination?
A. The angle between the star, the Earth and the Sun
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B. The angle between the axis of rotation of the star and an observer's line of sight on Earth
C. The ratio of the equatorial to polar rotation rates of the star
D. The change in the angle of the axes of surface and core rotation
Options:
8995146456. 1
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8995146457. 2
8995146458. 3
8995146459. 4
Sub-Section Number : 2
Sub-Section Id : 89951431
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Question Shuffling Allowed : Yes
Question Id : 8995141622 Question Type : COMPREHENSION Sub Question Shuffling Allowed : Yes Gro : No
Question Numbers : (26 to 50)
Question Label : Comprehension
CONSTANTS AND CONVERSION FACTORS:
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Speed of light c = 3 x 108ms-1
Planck's constant h = 6.626 × 10-34J.s
Gravitational constant G = 6.674 × 10-11m3kg-1s-2
Mass of proton mp = 1.673 x 10-27 kg
Mass of electron me = 9.109 × 10-31kg
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Stefan-Boltzmann constant s = 5.670 × 10-8Jm-2s-1K-4
Boltzmann constant k = 1.381 × 10-23JK-1
Mass of Sun M? = 1.989 × 1030 kg
Luminosity of Sun L?= 3.83 × 1026 W
Radius of Sun R?= 6.96 × 108 m
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Mass of Earth M? = 5.972 × 1024kg
1eV = 1.602 x 10-19J
1pc = 3.26ly; 1pc = 3.086 × 1016m; 1ly = 9.461 × 1015m
1yr = 3.154 × 107s
Sub questions
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Question Number : 28 Question Id : 8995141624 Question Type : MCQ
This download link is referred from the post: ARPIT Last 10 Years 2011-2021 Previous Question Papers
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