Recent questions tagged #mcq

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An object of mass m moves horizontally, increasing in speed from `0` to `v` in a time `t`. The power necessary to accelerate the object during this time period

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A 60 HP electric motor lifts an elevator having a maximum total load capacity of `2000 kg`. If the frictional force on the elevator is `4000 N`, the speed of the elevator at full load is close to (take, `1 HP = 746 W and g=10

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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For a system to follow the law of conservation of linear momentum during a collision, the condition is I. total external force acting on the system is zero II. total external force acting on the system is finite and time of collision is negligible III. total internal force acting on the system is

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Two identical balls A and B having velocities of `0.5 ms^(-1) and -0.3 ms^(-1)` respectively, collide elastically in one dimension. The velocities of B and A after the collision respectively will

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A particle of mass `1g` moving with a velocity `v_1= (3hati - 2hatj) ms^(-1)` experiences a perfectly elastic collision with another particle of mass `2 g` and velocity `v_2=(4hatj - 6hatk) ms^(-1)`. The velocity of the particle

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A particle of mass `m_1` moves with velocity `v_1`, collides with another particle at rest of equal mass. The velocity of second particle after the elastic collision

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Two objects of mass `m` each moving with speed `mu ms^(-1)` collide at 90°, then final momentum is (assume collision is

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A body of mass `5 xx 10^3 kg` moving with speed `2ms^(-1)` collides with a body of mass `15 xx 10^3 kg` inelastically and sticks to it. Then, loss in kinetic energy of the system will

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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If the linear momentum of a body is increased by 50%, then the kinetic energy of that body increases

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A ball of mass `m` moves with speed `v` and strikes a wall having infinite mass and it returns with same speed, then the work done by the ball on the wall is

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A body of mass `5 kg` is thrown vertically up with a kinetic energy of `490J.` The height at which the kinetic energy of the body becomes half of the original value is

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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If two persons A and B take `2 s and 4 s`, respectively to lift an object to the same height h, then the ratio of their powers is

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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At time `t = 0`, particle starts moving along the `x`-axis. If its kinetic energy increases uniformly with time `t`, the net force acting on it must be proportional to `t^n`, where the value of `n` is

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Which of the following statement is correct about non-conservative

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Which of the following statement is

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Which of the following statement does not specify an example of perfectly inelastic

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Match the Column I (angle) with Column II (work done) and select the correct option from the codes given below. Column I Column II A. `theta < 90°` p. Friction B. `theta= 90°` q- Satellite rotating around the earth C. `0 > 90°` r. Coolie is lifting a luggage

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A body is moved along a straight line by a machine delivering a power proportional to time `(P prop t)`. Then, match the Column I with Column II and select the correct option from the codes given below. Column I Column II A. Velocity is proportional to p. `t` B. Displacement is proportional to q. `t^2` C. Work done is proportional to r. `t^3`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: Stopping distance =`('Kinetic energy')/('Stopping force')`. Reason: Work done in stopping a body is equal to change in kinetic energy of the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: A spring of force constant `k` is cut into two pieces having lengths in the ratio 1 : 2. The force constant of series combination of the two parts is `2k'/'3`. Reason: The spring connected in series are represented by `k= k_1+

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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