A body is projected vertically upwards. The times corresponding t

Subject

Physics

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Dimensional formula for the universal gravitational constant G is

  • [M-1L2T-2]

  • [M0L0T0]

  • [M-1L3T-2]

  • [M-1L3T-1]


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2.

A body is projected vertically upwards. The times corresponding to height h while ascending and while descending are t1 and t2 respectively. Then the velocity of projection is (g is acceleration due to gravity)

  • gt1t2

  • gt1t2t1 + t2

  • gt1t22

  • gt1 + t22


D.

gt1 + t22

In case of motion under gravity, time taken to go up is equal to the time taken to fall down through the same distance.

Time of descent (t2) = time of ascent (t1) = ug  Total time of flight T = t1 + t2 = 2ug     u = gt1 + t22


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3.

A mass of 10 kg is suspended from a spring balance. It is pulled aside by a horizontal string so that it makes an angle of 60° with the vertical. The new reading of the balance is

  • 20 kg-wt

  • 10 kg-wt

  • 103 kg-wt

  • 203 kg-wt


4.

A body of mass 4 kg is accelerated upon by a constant force, travels a distance of 5 m in the first second and a distance of 2 m in the third second. The force acting on the body is

  • 2 N

  • 4 N

  • 6 N

  • 8 N


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5.

If μ0 is permeability of free space and ε0 is permittivity of free space, the speed of light in vacuum is given by

  • μ0ε0

  • μ0ε0

  • 1μ0ε0

  • ε0μ0


6.

A body weighs 50 g in air and 40 g in water. How much would it weigh in a liquid of specific gravity 1.5 ?

  • 30 g

  • 35 g

  • 65 g

  • 45 g


7.

A simple pendulum is suspended from the ceiling of a lift. When the lift is at rest its time period is T. With what acceleration should the lift be accelerated upwards in order to reduce its period to T/ 2? (g is acceleration due to gravity).

  • 2 g

  • 3 g

  • 4 g

  • g


8.

If γ is the ratio of specific heats and R is the universal gas constant, then the molar specific heat at constant volume CV is given by

  • γR

  • γ - 1 Rγ

  • Rγ - 1

  • γRγ - 1


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9.

An ideal gas is taken via path ABCA as shown in figure. The net work done in the whole cycle is

         

  • 3p1V1

  • − 3p1V1

  • 6p1V1

  • Zero


10.

In which of the processes, does the internal energy of the system remain constant ?

  • Adiabatic 

  • Isochoric

  • Isobaric

  • Isothermal


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