CSAT Prelims General Awareness - Physics Multiple Choice Questions and Answers

1 A hunter aims his gun at a point between the eyebrows of a monkey sitting on a branch of a tree. Just as he fires, the monkey jumps down. The bullet will:

A hit the monkey at the point aimed

B hit the monkey above the point aimed

C hit the monkey below at the point aimed

D miss the monkey altogether

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Answer: Option [A]

2 An oil tanker partially filled with oil moves forward on a level road with uniform acceleration. The free surface of oil then:

A remains horizontal

B assumes a parabolic curve

C is inclined to the horizontal with smaller depth at the rear end

D is inclined to the horizontal with larger depth at the rear end

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Answer: Option [D]

3 A spherical body moves with a uniform angular velocity (w) around a circular path of radius r. Which one of the following statements are correct ?

A The body has no acceleration

B The body has a radial acceleration ω²r directed toward centre of path

C The body has a radial acceleration 2/5ω²r directed away from the centre of the path

D The body has an acceleration ω² tangential to its path

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Answer: Option [B]

4 Four wires of same material and of dimensions as under are stretched by a load of same magnitude separately. Which one of them will be elongated maximum ?

A Wire of 1m length and 2 mm diameter

B Wire of 2m length and 2mm diameter

C Wire of 3m length and 1.5mm diameter

D Wire of 1m length and 1mm diameter

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Answer: Option [C]

5 Ball bearings are used in bicycles, cars, etc., because

A the effective area of contact between the wheel and axle is reduced

B the effective area of contact between the wheel and axle is increased

C the actual area contact between the wheel and axle is increased

D none of the above statements is correct

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Answer: Option [A]

6 Cloudy nights are warmer compared to clear cloudless nights, because clouds:

A reflect back the heat given off by earth

B produce heat and radiate it towards earth

C prevent clod waves from the sky from descending on earth

D absorb heat from the atmosphere and send it towards earth

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Answer: Option [A]

7 When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of:

A reflection and transmission

B reflection and diffraction

C diffraction and transmission

D refraction, diffraction and transmission

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Answer: Option [D]

8 Which one of the following statements is not correct ?

A The velocity of sound in air is independent of pressure

B The velocity of sound in air decreases as the humidity increases

C The velocity of sound in air increases with the increase of temperature

D The velocity of sound in air not affected by the change in amplitude and frequency

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Answer: Option [B]

9 A fuse is used in mains electric supply as a safety device. Which one of the following statements about the fuse is correct ?

A It must have a low melting point

B It is made mainly from silver alloys

C It must have very high resistance

D It is connected in parallel with the main switch

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Answer: Option [A]

10 Electrically charged particles from space traveling at speeds of several hundred km/sec can severally harm living beings if they reach the surface of the earth. What prevents them from reaching the surface of the Earth ?

A The Earth’s magnetic field diverts them towards its poles

B Ozone layer around the Earth reflects them back to outer space

C Moisture in the upper layers of atmosphere prevents them from reaching the surface of the Earth

D None of the statements (A), (B) and (C) given above is correct

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