Sample Paper Astronomy Jl

8/8/2019 Sample Paper Astronomy Jl

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INDIAN ASSOCIATION OF PHYSICS TEACHERSNATIONAL STANDARD EXAMINATION IN ASTRONOMY

Sample paper – JUNIOR LEVEL

Approximate Values of some important constants are:

Mass of Earth ~ 6 x 1024 kg Mass of Sun ~ 2 x 1030 kgRadius of Earth ~ 6,000 km Radius of Sun ~ 7 x 108 Meter1 AU ~ 1.5 x 1011 meter 1 parsec ~ 3.26 light years1 year ~ 3 x 107 sec Speed of light ~ 3 x 108 m/sCharge of electron ~ 1.6 x 10-19 C Mass of electron ~ 9 x 10-31 kgAvogadro Constant ~ 6.02 x 1026 /kmole Mass of proton ~ 1.7 x 10-27 kgGravitational Constant ~ 6.7 x 10-11 (MKS) Planck Constant ~ 7 x 10-34 JsBoltzmann’s Constant ~ 1.4 x 10-33 J/K Stefan’s Constant ~ 6 x 10-8J/s/m2 g = 10 m/s2



ATTEMPT ALL QUESTIONS

Total Marks: 150 Duration: 90 Minutes

Section I

There are 30 questions, each having one correct option.

Each correct answer carries 3 marks, while each wrong answer has a penalty of 1 mark.

1) A cycle tends to slip on a wet road but not on a dry road because

a) Dry road has lower frictionb) Shining surface of a wet road reflects the bicyclec) The reaction exerted by a tar surface is strongerd) Water acts as a lubricant

2) The length of a year is 365.24 days but I assume it to be 365.00 days. What is thepercentage error in my calculation?

a) 0.07 yearsb) 0.14%c) 0.24 daysd) 0.07%

3) What is the angular speed of a second’s hand of a watch?

a) 1 radian/sb) 2 π radians/sc) ~ 0.1 radians/minuted) 2 π radians/ minute

4) Assume that an object is 10 light years away from you. Calculate its distance in km.

a) 1 x 102 b) 9 x 1010 c) 9 x 1013

d) 9 x 1016

5) If there were no atmosphere, the duration of day light on the earth will

a) decreaseb) increasec) remain same

d) will decrease or increase depending on latitude

6) A telescope with a magnification of 100 X has an eyepiece of focal length 32 mm. It isplaced in Allahabad. What is the farthest object you can see with this telescope?

a) Top of Mount Everestb) Plutoc) Edge of Milky wayd) Andromeda Galaxy



7) y = log(log(10)). What is the value of y?

a) –1b) 0c) 1d) 10

8) Which of the following stars is not on the Zodiacal Belt?

a) Spicab) Polluxc) Aldebarand) Sirius

9) Which of the following constellations is circumpolar from Delhi?

a) Hydrab) Leo Minorc) Ursa Minord) Libra

10) A thick mirror forms multiple images. Which image will be the brightest?

a) 1st b) 2nd c) 3rd d) last

11) A microphone does the following

a) It converts sound energy into electrical energy

b) It amplifies the soundc) It converts electrical energy into sound energyd) It converts sound energy into mechanical energy

12) A blue coloured torch is viewed through a red filter. What will you see?

a) The torch light will appear blueb) The torch light will appear redc) The torch light will appear whited) No torch light will be seen



13) A crab is moving towards the mirror (see figure below) at 2 cm/s making an angle of 600 with the mirror. .At what rate will the image of the crab move towards the crab

a) 1 cm/sb) \/ 3c) 2 cm/sd) 4 cm/s

14) In the figure below black boxes indicate resistances. How much energy is dissipated in thecircuit below in 1 minute?

a) 50 J b) 60 J c) 360 J d) 1800 J

15) If A and B are two sets with 3 and 6 elements respectively, what is the minimum numberspresent in the set A U B ?

a) 3

b) 6c) 9d) 18

16) A person of mass 50 kg drinks 1 litre of water. What is his approximate increase in mass?

a) 0.02 kgb) 0.2 kgc) 1 kgd) 2 kg



17) Three resistances of value 1, 2 and 5 have to be connected in such a way that all theresistances are used once. Which value of resistance cannot be obtained?

a) 17/3b) 17/4c) 17/6d) 17/7

18) A plane mirror starts going away from you at a speed of 20 cm/s from a distance of 50 cm/sfrom you. You can see your image in it. At the 4 th second the distance of your image fromyou will be

a) 130 cmb) 260 cmc) 180 cmd) 360 cm

19) The refractive index of water is 1.33. The speed of light in water isa) 1.33 x 108 m/sb) 2.25 x 108 m/s

c) 3 x 108

m/sd) 4 x 108 m/s

20) If a/ ( b+c) = b / ( a + c) = c / (a +b) and a+b+c is ≠ 0, then each ratio is

a) 1b) 1/2c) 0d) -1

21) Bhargava Ram is facing two equidistant mirrors which are at 45

0

to each other. Assuming heis not drunk, how many images will he see of himself?a) 2b) 3c) 7d) 8

22) Two mirrors are placed parallel to each other on a sea-saw. A beam incident in an almostvertical plane, on the first mirror is reflected to be incident on the second and then is furtherreflected to form a spot on the wall at some distance away. If the sea-saw is turned throughan angle θ, through what angle the reflected beam will turn?

a) zerob) θ c) 2 θ d) 4 θ

23) A star A is green in colour while star B is red in colour. If the two stars collide to form a singlestar what will be its colour?

a) redb) orangec) yellowd) blue



24) Which of the following stars you will not surely observe tonight?

a) Siriusb) Regulusc) Polarisd) Antares

25) For the regular pentagon ABCDEA, L CAE = ?

a) 540 b) 600 c) 660 d) 720

26) Astronomers prefer larger telescope because

a) it gives brighter imageb) it gives larger imagec) it gives larger field of view

d) it is sensitive to wider range of wavelengths

27) Parag arrives at Pimpari railway station from office everyday at 6:00 pm. Where Prajaktapicks him up in the car to take him home. One day he arrives at Pimpari one hour early andstarts walking towards home. On the way he meets Prajakta and they return home togetherin the car. If they arrive home 10 minutes earlier then what is the ratio of Parag’s walkingspeed to the Prajakta’s driving speed?

a) 1/11b) 1/10c) 1/60d) data is not sufficient

28) If the plane in which the moon orbits the earth were same as the plane in which the earthorbits the sun, how often in a year would we observe the full moon?

a) everydayb) 12 timesc) 25 timesd) never

29) A wooden cube ( density 0.06 g/cc) just dips inside the water if pressed with a force of 10N.What must be the side of the cube? (Assume g = 10 m/s2)

a) 1/ 401/3 m

b) 1/ 400

1/3

mc) 1/40001/3 md) 0.5 m

30) A boat can carry at the most three persons at a time. If 9 persons have to cross the riverusing the boat, how many minimum number of times it must cross the river?

a) 3b) 4c) 5d) 7

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Section II

There are 10 questions with 6 marks each. Each question may have more than one correctalternative. If all the correct alternatives are marked, only then 6 marks will be allotted.Else 0 marks.

________________________________________________________________________________

1) A body A of density ρ is immersed in a liquid B of density ρ’. Then,

a) apparent loss in weight of A is zero if ρ < ρ’b) A can remain in any position inside B if ρ = ρ’c) A apparently loses all its weight if ρ < ρ’d) The fraction of the volume of A below B is ρ / ρ’ if ρ < ρ’

2) A group of parallel rays is incident on a lens. The rays after refraction would converge ordiverge depends upon

a) the size of the lensb) the radii of curvature of the two surfaces

c) the refractive index of the surrounding mediumd) the refractive index of the material of the lens

3) The planet/s that does/do NOT have natural satellite is/are

a) Marsb) Mercuryc) Jupiterd) Venus

4) The time rate of conduction of heat through a given slab of a material depends upona) temperature of the surrounding

b) area of cross sectionc) thickness of the slabd) the temperature difference across the slab

5) Two plane mirrors are placed in such a manner that a light ray incident on the first getsreflected towards the other and finally gets reflected along a line parallel to the initial ray.Therefore, the angle between the two mirrors can be

a) 450 b) 900 c) 00 d) 600

6) A light bulb is said to be only 10 % efficient. This means

a) only 10 % of the electrical energy is consumedb) 90 % energy goes as heatc) only 10 % energy is converted to lightd)as compared to tube light only 10 % light is given


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Astronomy Sr. 8

7) The Sun appears oval shaped when it is at the horizon, it is due to

a) More dispersion of light through atmosphere from lower edge of Sun than from itsupper edge

b) More diffraction of light through atmosphere from lower edge of Sun than from itsupper edge

c) More refraction of light through atmosphere from lower edge of Sun than from itsupper edge

d) More interference of light through atmosphere from lower edge of Sun than from itsupper edge.

8) Which of the following can produce a virtual image?a) Plane mirrorb) Convex mirrorc) Concave mirrord) Prism

9) Lightening arrester is pointed because

a) induced charge density is highest at pointed surface

b) direction of electric field is well definedc) lightening is always a thin streakd) it provides minimum resistance to wind

10) World’s best observatories are situated at mountaintops becausea) it is closer to the sunb) clouds are lessc) atmosphere is thind) it is cool and comfortable there

End of Junior Level Section II

Sample Paper Astronomy Jl

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