Q.1.
A block of mass m is at rest under the action of force F against a wall as shown in figure. Which of the following statements is correct [ IIT 2005]
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25%
a)f=mg [ where f is the friction force]
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50%
b) F=N [ where N is normal force]
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12%
c)F will not produce torque
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12%
d)N will not produce torque
Explanation
Q.2.
The position time graph of a particle of mass 0.1kg is shown in figure. The impulse at t=2sec is [AIIMS 2005]
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50%
a) 0.2kg ms-1
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0%
b) 0.02kg ms-1
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25%
c)0.1kg ms-1
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25%
d)0.4kg ms-1
Q.3.
A player caught a cricket ball of mass 150g moving at the rate of 20m/s. If the catching process be completes in 0.1s, the force of the blow exerted by the ball on the hands of the player is [ kerala CET 2005]
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50%
a) 0.3 N
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33%
b) 30 N
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17%
c)300 N
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0%
d)3000 N
Q.4.
Two masses M and M/2 are joined to gather by means of light in-extensible string passed over a frictionless pulley. When the bigger mass is released, the small one will ascend with an acceleration of .. [ keralaCET 2005]
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25%
a) g/3
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25%
b) 3g/2
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25%
c) g
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25%
d) g/2
Explanation
Q.5.
A book is lying on the table. What is the angle between the action of the block on the table and the reaction of the table on the book [ kerala PMT 2005]
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25%
a)0°
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25%
b) 30°
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0%
c)90°
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50%
d)180°
Q.6.
A man holds the book weighing 10N between the hands and keep it free from falling by pressing both the hands against the book with force of 25N each. The coefficient of friction between the book and hand would be [ CET 1998]
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0%
a) 0.1
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0%
b) 0.2
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67%
c)0.4
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33%
d)0.6
Q.7.
When a bicycle is in motion, the force of friction exerted by ground on the two wheels is such that it acts [ IIT 1990]
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33%
a) in the backward direction on the front wheel and in the forward direction on the rear wheel.
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0%
b)in the forward direction on the front wheel and in the backward direction on the rear wheel
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67%
c)in the backward direction on the both the front and the rear wheel
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0%
d)in the forward direction on the both the front and the rear wheel
Q.8.
While walking on ice, one should take small steps to avid slipping. This is because, small steps ensure
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40%
a) Large friction
-
20%
b) smaller friction
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20%
c) large normal force
-
20%
d) smaller normal force
Q.9.
Two cars of unequal masses are having similar tyres. If they are moving with at the same initial speed, the minimum stopping distance
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0%
a)is smaller for the heavier car
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67%
b) is smaller for the lighter car
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33%
c)is same for both cars
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0%
d)cannot be predicted
Q.10.
in order to stop a car in shortest distance on the horizontal road, one should
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0%
a) apply the brakes very hard, so that the wheels stop rotating
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33%
b) apply the brakes hard enough to just prevent slipping
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0%
c)press and release the brakes
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67%
d)shut the engine off and should not apply brakes
Q.11.
A weight W rests on a rough horizontal plane. If the angle of friction be θ, the least force that will move the body along the plane will be [ IIT 1987]
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50%
a) W cosθ
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25%
b) W tanθ
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25%
c) W cotθ
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0%
d) W sinθ
Q.12.
A rocket with a lift-off mass 3.5×104kg is blasted upwards with an initial acceleration of 10 m/sThen, initial thrust of blast is [ AIEEE 2003]
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33%
a)3.5×105N
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33%
b) 7.0×105 N
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33%
c)14.0×105 N
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0%
d)1.75×105 N
Q.13.
If the force on a rocket moving with velocity of 300 m/s is 210 N, then the rate of combustion of the fuel is [ CBSE 1999]
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25%
a) 0.7 kg/s
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25%
b) 1.4 kg/s
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50%
c)0.07 kg/s
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0%
d)10.7 kg/s
Explanation
Q.14.
A 5000 kg rocket is set for vertical firing. The exhaust speed is 800m/s. To give an initial acceleration of 20 m/s2, the amount of gas ejected per second to supply the needed thrust will be (g=10 m/s2 [CBSE 1998]
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25%
a)127.5 kg s-1
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0%
b) 137.5 kg s-1
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50%
c)155.5 kg s-1
-
25%
d)187.5 kg s-1
Explanation
Q.15.
A 100 kg man jumps into a swimming pool from a height of 5m. It takes 0.4s for the water to reduce his velocity to zero. The average force exerted by the water on the man is [ CEt 1998]
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0%
a)25 N
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0%
b) 250 N
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33%
c)2500 N
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67%
d)5000 N
Q.16.
A nucleus ruptures into two nuclear parts, which have their velocity ratio equal to 2:What will be the ratio of there nuclear size ( nuclear radius) [ CBSE 1996]
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33%
a) 2 1/3 : 1
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33%
b) 1: 2 1/3
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0%
c) 3 1/2 : 1
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33%
d) 1:3 1/2
Q.17.
Essential characteristic of equilibrium is [ Roorkee 1989]
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25%
a)momentum equal to zero
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0%
b)acceleration equal to zero
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50%
c)kinetic energy is zero
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25%
d)velocity equal to zero
Q.18.
A glass of water is kept on a table in the dining car of a train. If acceleration of the train is (g/5) in the forward direction, the surface of water is inclined to the horizontal at an angle of [ CET 1994]
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0%
a) tan-1(5/2)
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50%
b) tan-1(2/5)
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0%
c)tan-1(1/5)
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50%
d)tan-1(5)
Explanation
Q.19.
One end of a spring balance is stretched by the force of 2N and equal and opposite force is applied on its other end. The reading of the spring balance will be
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0%
a) 4N
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0%
b) 2N
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67%
c)0
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33%
d)any value between 0 and 4N
Q.20.
When we kick a stone, we get hurt. Due to which property of the stone it happens?
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9%
a) Inertia
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0%
b) Velocity
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0%
c) Reaction
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91%
d) Momentum
Q.21.
Two skaters of mass 40kg and 60kg respectively stand facing each other at A and B where AB is 5 meters. They pull on a mass less rope stretched between them, then they meet at
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0%
a)25 meters from And B
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100%
b) 3 meters from A and 2 meters from B
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0%
c)2 meters from A and 3 meters from B
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0%
d)3 meters from A and 8 meters from B
Q.22.
When one swims across a flowing river, maximum energy is spend in [ AIIMS 1985]
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0%
a) first 1/3 of the distance
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0%
b) second 1/3 of the distance
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0%
c)last 1/3 of the distance
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100%
d)equal energy throughout
Q.23.
We can derive Newton's
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0%
a) second and third laws from the first law
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0%
b) first and second laws from the third law
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0%
c)third and first laws from the second law
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100%
d)All the three laws are independent of each other
Q.24.
Three equal weights A, B,C of mass 2 kg each are hanging on a string passing over a fixed pulley which is frictionless as shown in figure. The tension in the string connecting weight B and C is [ JIPMER 1998]
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100%
a) zero
-
0%
b) 13 N
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0%
c) 3.3 N
-
0%
d) 19.6 N
Q.25.
With what minimum acceleration can a fireman slide down a rope whose breaking strength is two-third of his weight
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0%
a)(2/)g
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0%
b) (1/3)g
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0%
c)9
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100%
d)zero
Q.26.
The rear side of a truck is open and a box of mass 20kg is placed on the truck 4 metres away from the open end. µ=0.15 and g=10 m/s2.The truck starts from rest with acceleration of 2m/s2 on straight road. The box will fall off the truck when it is at a distance from the starting point equal to ..
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0%
a) 4 metres
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0%
b) 8 metres
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50%
c)16 metres
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50%
d)32 metres
Q.27.
Gravels are dropped on a conveyor belt at the rate of 0.5kg/sec. The extra force required in Newton to keep the belt moving at 2m/s is [ EAMCET 1988]
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0%
a) 1 N
-
0%
b) 2 N
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100%
c)4 N
-
0%
d)0.5N
Explanation
Q.28.
A parachutist of weight 'w' strikes the ground with his legs fixed and come to rest with an upward acceleration of magnitude 3g. Force exerted on him by ground during landing is
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0%
a) w
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50%
b) 2w
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50%
c) 3w
-
0%
d) 4w
Q.29.
Two masses A and B of 10kg and 5kg respectively are connected with a string passing over a frictionless pulley fixed at the corner of a table as shown in figure. The coefficient of friction A with the table is 0.The minimum mass of C that may be placed on A to prevent it from moving is equal to
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0%
a)15 kg
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33%
b) 10 kg
-
33%
c)5 kg
-
33%
d)0 kg
Explanation
Q.30.
The law of conservation of momentum is a logical consequence of Newton's
-
0%
a) first law
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67%
b) second law
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0%
c)third law
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33%
d)all the three laws