161. 'Parsec' is the unit of'

• time

• distance

• frequency

• angular acceleration

When a ball is thrown up vertically with velocity  v_o, it reaches a maximum height of h. If one wishes triple the maximum height then the ball should be thrown with velocity

• $\sqrt{3}$ v_o

• 3v_o

• 9v_o

• 3/2 v_o

A person is standing in an elevator. In which situation he finds his weight less?

• When the elevator moves upward with constant acceleration

• When the elevator moves downward with constant acceleration

• When the elevator moves upward with uniform velocity

• When the elevator moves downward with uniform velocity

Using mass (M), length (L), time (T) and current (A) as fundamental quantities, the dimension of permittivity is

• [ M L^-2 T² A ]

• [ M^-1 L^-3 T⁴ A² ]

• [ M L T^-2 A ]

• [ M L² T^-1 A² ]

A body starting from rest moves along a straight line with a constant acceleration. The variation of speed (v) with distance ( s ) is represented by the graph

A particle starts from rest and has an acceleration  of 2 m/s² for  10 sec. After that, it travels for 30 sec with constant speed and then undergoes a retardation of 4 m/s²  and comes back to rest. The total distance covered by the particle is

• 650 m

• 750 m

• 700 m

• 800 m

Speed in kilometre per hour in S.I unit is represented as

• KMPH

• Kmhr^-1

• Kmh^-1

• kilometre/hour

S.I unit of velocity is 

• ms

• m sec^-1

• m hr^-1

• m/hr

A particle moving with velocity (1/10)th of light will cross a nucleus in about

• 10^-8 s

• 10^-12 s

• 10^-47 s

• 10^-21 s

A coin is dropped in a lift. It takes time t₁ to reach the floor when the lift is stationary. It takes times t₂ when the lift is moving up with constant acceleration. Then:

• t₁ > t₂

• t₂ > t₁

• t₁ = t₂

• t₁ >> t₂