A truck and a car are moving with equal velocity. On applying brakes, both will stop after a certain distance, then?
A. Truck will cover less distance before stopping
B. Car will cover less distance before stopping
C. Both will cover equal distance
D. None of the mentioned
What sort of energy does flying bird possess?
A. Potential energy
B. Kinetic energy
C. Both potential and kinetic energy
D. Both potential and kinetic energy
When the velocity of an aero plane is doubled, the momentum
A. Remains unchanged
B. Is conserved
C. Becomes zero
D. Increases uniformly
A machine gun fires 60 bullets per minute, with a velocity of 700m/s. If each bullet has a mass of 50g, find the power developed by the gun.
A. 1225W
B. 12250W
C. 122.5W
D. 122W
A bullet fired from a gun can pierce a target due to its
A. Mechanical energy
B. Heat energy
C. Kinetic energy
D. Acceleration
Kinetic energy with any reference must be
A. Zero
B. Positive
C. Negative
D. Either negative or positive
At what angle work done will be maximum?
A. 0°
B. 45°
C. 90°
D. 30°
Which one of the following is a greater work?
A. +100 J
B. -1000 J
C. -100 J
D. +200 J
Work done will be zero if angle between Force and displacement is:
A. 0°
B. 270°
C. 60°
D. 360°
A force 2i+j has moved its point of application from (2,3) to (6,5). What is work done?
A.-10
B.-18
C. +10
D. +18
At what angle the work done will be half of its maximum value
A. 0°
B. 300°
C. 45°
D. 60°
A man pushes a wall with 50 (N) and it displaces it zero (m), his work is
A. Negative
B. No work
C. Positive
D. May all possible
If a mass of 5 Kg is lifted upto 5m height, what will be the work done against the gravitational field
A. 245 J
B. 25 J
C. 49 J
D. 98 J
A person walks 2 m with an acceleration of 5 ms-2, holding an object of mass 2 kg. The net work done on the object is
A. 20 J
B. 10 J
C. 5 J
D. 0 J
A force of 3i+2j+4k N gives displacement of 10j m. The work done is
A. 20 J
B. 26 J
C. 32 J
D. Zero
A body travels displacement of 10 m by force of 5 N If work done is 25 J then angle between F and d is
A. 0°
B. 450°
C. 30°
D. 60°
A person holds a bucket of weight 60 N. He walks 7 m along the horizontal path and then climbs up a vertical distance of 5 m. The work done by the gravity is:
A. 300 N-m
B. 720 N-m
C. 420 N-m
D. None of these
If force and displacement of particle in direction of force are doubled. Work would be
A. Double
B. 1/4 times
C. Half
D. 4 times
A person is holding a bucket by applying a force of 10N. He moves a horizontal distance of 5m and then climbs up a vertical distance of 10m. Find the total work done by him?
A. 50J
B. 100J
C. 150J
D. 2003
A gardener pushes a lawn roller through a distance of 20m. If he applies a force of 20kg weight in a direction inclined at 60° to the ground, find the work done by him. (g = 9.8m/s²)
A. 400J
B. 250J
C. 1960J
D. 2514J
If velocity is double, then
A. Momentum increase 4 times and K.E increases 2 times
B. Momentum increases 2 times and K.E increase constant
C. Momentum and K.E remain same
D. Momentum increases 2 times and K.E increases 4 times
What will be the ratio of kinetic energies of alpha particle and proton if their linear momentum will be same?
A. 18:1
B. 4:1
C. 1:4
D. 104: 1
The Bodies of one kg and four kg have same kinetic energy. The ratio in their momenta will be
A. 1:2
B. 1:4
C. 1:16
D. 1:1
The velocity and momentum of a moving body are 10,000 cm-s-1 and 10,000 g cm-s-1 respectively. The K.E will be
A. 5 × 10s7 J
B. 5×10 J
C. 5 x 10s2 J
D. 5X10° J
If momentum of a moving object is doubled then its kinetic energy will be
A. Doubled
B. Four times
C. Halved
D. Same
The momentum and kinetic energy of a ball is numerically equal. The numerical value of velocity is
A. 1 m/s
B. 3 m/s
C. 2 m/s
D. 4 m/s
Kinetic energy of a body moving with speed of 10 ms-1 is 30 J. If its speed becomes 30 m/s its K.E will be
A. 10 J
B. 90 J
C. 180 J
D. 270 J
Car X is traveling at half the speed of car Y. Car X has twice mass of car Y. Which statement is correct?
A. Car X has half the kinetic energy of car Y
B. Car X has twice the kinetic energy of car Y
C. Car X has one quarter of the kinetic energy of car Y
D. The two cars have the same kinetic energy
A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ratio of:
A. √2:1
B. 1:2
C. 1:4
D. 1:√2
A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 m s'. The K.E of other mass is
A. 324 J
B. 256 J
C. 486 J
D. 524 J
The kinetic energy acquired by a body of mass m is travelling some distance s, starting from rest under the actions of a constant force, is directly proportional to
A. m0
B. m
C. m²
D. m1/2
When force and displacement are in the same direction, the kinetic energy of the body
A. Increases
B. Remains constant
C. Decreases
D. Becomes zero
A truck and a car are moving with equal velocity. On applying brakes, both will stop after a certain distance, then?
A. Truck will cover less distance before stopping
B. Both will cover equal distance
C. Car will cover less distance before stopping
D. None of the mentioned
Potential energy per unit volume is given by
A. mgh
B. gh
C. mgh/ρ
D. ρgh
A body is falling from a height h. After it has fallen a height h/2, it will possess
A. Only potential energy
B. Half potential and half kinetic energy
C. Only kinetic energy
D. More kinetic and less potential energy
Energy stored in the spring of watch is
A. Electrical energy
B. potential energy
C. Kinetic energy
D. Elastic potential energy
A stone is thrown up from the surface of earth when it reaches at maximum height. Its total energy is equal to
A. mgh
B. 1/2mv2
C. Zero
D. 2 mgh
Energy consumed by 60-watt bulb in 2 minutes is equal to
A. 7.2 kilo joules
B. 120 joules
C. 720
D. 72000 joules
The consumption of energy by 60-watt bulb in 2 seconds is:
A. 201
C. 120 J
B. 30J
D. 0.02 J
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