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Subject:Physics

The dimension of Planck’s constant is same as that of

A.) linear momentum
B.) work

C.) coefficient of viscosity
D.) angular momentum

Answer is option : D

Subject:Physics

A fighter aeroplane flying in the sky dives with a speed of 360 km/hr in a vertical circle of radius 200 m. Weight of the pilot sitting in it is 75 kg. What will be the value of force with which the pilot presses his seat when the aeroplane is at highest position (g = 10 m/s²).

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A.) 300 N
B.) 3000 N

C.)
D.) 1500 N

Answer is option : D

Subject:Physics

A coin kept on a rotating gramophone disc just begins to slip if its centre is at a distance of 8 cm from the centre of the disc. The angular velocity of the gramophone disc is then doubled. Through what distance, the coin should be shifted towards the centre, so that the coin will just slip?

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A.) 2 cm
B.) 16 cm

C.) 4 cm
D.) 6 cm

Answer is option : A

Subject:Physics

A cyclist turns around a curve at 15 miles per hour. If he turns at double the speed, the tendency of overturn is

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A.) quadrupled
B.) doubled

C.) unchanged
D.) halved

Answer is option : A

Subject:Physics

A frictional track ABCDE ends in a circular loop of radius R, body slides down the track from point A which is at a height h of 5 cm. Maximum value of R for the body to successfully complete the loop is?

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A.) 10/3 cm
B.) 2 cm

C.) 15/4 cm
D.) 5 cm

Answer is option : B

Subject:Physics

A car of mass 1000 kg moves on a circular road with a speed of 20 m/s. Its direction changes by 90° after traveling 628 m on the road. The centripetal force acting on the car is ?

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A.) 1000 N
B.) 1500 N

C.) 500 N
D.) 2000 N

Answer is option : A

Subject:Physics

A car sometimes overturns while taking a turn. When it overturns, it is

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A.) the outer wheel which leaves the ground first
B.) both the wheel leave the ground simultaneously

C.) either inner wheel or the outer wheel leaves the ground
D.) the inner wheel which leaves the ground first

Answer is option : D

Subject:Physics

A car moving on a horizontal road may be thrown out of the road is taking a turn:

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A.) by the gravitational force
B.) due to the reaction of the ground

C.) due to the lack of frictional force between the tire and the road
D.) due to the lack of proper centripetal force

Answer is option : C

Subject:Physics

A car of mass 800 kg moves on a circular track of radius 40 m. If the coefficient of friction is 0.5, then maximum velocity with which the car can move is

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A.) 7 m/s
B.) 14 m/s

C.) 8 m/s
D.) 12 m/s

Answer is option : B

Subject:Physics

A car is moving on a circular path and takes a turn. If R₁ and R₂ are the reactions on the inner and outer wheels respectively, then

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A.) R1 = R2
B.) R1 ≥ R2

C.) R1 < R2
D.) R1 > R2

Answer is option : C

Subject:Physics

A car is moving in a circular track of radius 10 metre with a constant speed of 10 m/sec. A plumb bob is suspended from the roof of the car by a light rigid rod of 1 metre long. The angle made by the rod with the track is:

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A.) Zero
B.) 30 Degree

C.) 60 Degree
D.) 45 Degree

Answer is option : D

Subject:Physics

A bucket containing water is tied to one end of a rope of length 2.5 m and rotated about the other end in a vertical circle. What should be the minimum velocity of the bucket at the highest point, so that the water in the bucket will not spill? (take g = 10 m/s²)

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A.) 5 m/sec
B.) 2.5 m/sec

C.) 7 m/sec
D.) 4 m/sec

Answer is option : A

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