Random Questions Part-5

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1)   During a planned manoeuvre in a space flight, a free floating astronaut A pushes another free floating astronaut B, the mass of A being greater than that of B. then, the magnitude of the force exerted by Astronaut A on Astronaut B is

  • [A] Equal to zero
  • [B] Equal to the force exerted by B on A
  • [C] Greater than the force exerted by B on A
  • [D] Less than the force exerted by B on A

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Equal to the force exerted by B on A

2)   A motor cycle and a car are moving on a horizontal road with the same velocity. If they are brought to rest by the application of brakes, which provided equal retardation then

  • [A] Motor cycle will stop at shorter distance
  • [B] Car will stop at a shorter distance
  • [C] Both will stop at the same distance
  • [D] Nothing can be predicted

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Both will stop at the same distance

3)   A person is standing in an Elevator. The situation in which he finds his weight less than actual, is when

  • [A] The elevator moves upward with constant acceleration
  • [B] The elevator moves downward with constant acceleration
  • [C] The elevator moves upward with uniform velocity
  • [D] The elevator moves downward with uniform velocity

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The elevator moves downward with constant acceleration

4)   A person is standing in an Elevator. The situation in which he finds his weight less than actual, is when

  • [A] The elevator moves upward with constant acceleration
  • [B] The elevator moves downward with constant acceleration
  • [C] The elevator moves upward with uniform velocity
  • [D] The elevator moves downward with uniform velocity

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The elevator moves downward with constant acceleration

5)   A particle is acted upon by a constant force, the magnitude of which is always perpendicular to the velocity of particle. The motion of particle takes place in same plane. Select the correct statement

  • [A] Particle is moving in a circular path
  • [B] Magnitude of its acceleration is constant
  • [C] Its velocity is uniform
  • [D] Both a and b

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Both a and b

6)   A body thrown up with a velocity U reaches the maximum height H after T second. Which of the following statement is correct ?

  • [A] At a height H/2 from the ground its velocity becomes U/2
  • [B] At a time 2T its velocity becomes -U
  • [C] At a time T its velocity becomes U
  • [D] At a time 2T its velocity becomes -6U

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At a time 2T its velocity becomes -U

7)   Ice floats on the surface of water because

  • [A] Rate of evaporation increases with increase in humidity in air
  • [B] Evaporation of liquid is accompanied by decrease in temperature or cooling
  • [C] Rate of evaporation increases with increase in temperature
  • [D] Rate of evaporation increases with increase in surface area

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Rate of evaporation increases with increase in humidity in air

8)   What are the main scales of measuring the temperature ?

  • [A] Joules scale, Fahrenheit scale and Kelvin scale
  • [B] Joules scale, Kilojoules scale and Celsius scale
  • [C] SI scale,Kelvin scale and Celsius scale
  • [D] Celsius scale,Fahrenheit scale and Kelvin scale

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Celsius scale,Fahrenheit scale and Kelvin scale

9)   Which among the following is found in the greatest quantity in air ?

  • [A] Oxygen
  • [B] Carbon Dioxide
  • [C] Hydrogen
  • [D] Nitrogen

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Nitrogen

10)   A major portion of the electrical energy in India is generated from

  • [A] Solar energy
  • [B] Hydro energy
  • [C] Thermal energy
  • [D] Atomic energy

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Thermal energy

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