Work, Energy and Power · Physics · AP EAPCET

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MCQ (Single Correct Answer)

1
The upper $\left(\frac{1}{n}\right)$ th of an inclined plane is smooth and the remaining lower part is rough with coefficient of friction $\mu_k$. If a body starting from rest at the top of the inclined plane will again come to rest at the bottom of the plane, then the angle of inclination of the inclined plane is
AP EAPCET 2024 - 21th May Morning Shift
2
A spring of spring constant $200 \mathrm{~N}-\mathrm{m}^{-1}$ is initially stretched by 10 cm from the unstretched position. The work to be done to stretch the spring further by another 10 cm is
AP EAPCET 2024 - 21th May Morning Shift
3

A $4 \mathrm{~kg}$ mass is suspended as shown in figure. All pulleys are frictionless and spring constant $k$ is $8 \times 10^3 \mathrm{Nm}^{-1}$. The extension in spring is $\left(g=10 \mathrm{~ms}^{-2}\right)$

AP EAPCET 2024 - 20th May Morning Shift Physics - Work, Energy and Power Question 3 English
AP EAPCET 2024 - 20th May Morning Shift
4
Two bodies $A$ and $B$ of masses $2 m$ and $m$ are projected vertically upwards from the ground with velocities $u$ and $2 u$ respectively. The ratio of the kinetic energy of body $A$ and the potential energy of body $B$ at height equal to half of the maximum height reached by body $A$ is
AP EAPCET 2024 - 20th May Morning Shift
5
A force of $\left(6 x^2-4 x+3\right) \mathrm{N}$ acts on a body of mass 0.75 kg and displaces it from $x=2 \mathrm{~m}$ to $x=5 \mathrm{~m}$. The work done by the force is
AP EAPCET 2024 - 19th May Evening Shift
6
A spring of $5 \times 10^3 \mathrm{Nm}^{-1}$ spring constant is stretched initially by 10 cm from unstretched position. The work required to stretch it further by another 10 cm is
AP EAPCET 2024 - 18th May Morning Shift
7

A small disc of mass $$m$$ slides down with initial velocity zero from the top $$(A)$$ of a smooth hill of height $$H$$ having a horizontal portion $$(BC)$$ as shown in the figure. If the height of the horizontal portion of the hill is $$h$$, then the maximum horizontal distance covered by the disc from the point $$D$$ is

AP EAPCET 2022 - 5th July Morning Shift Physics - Work, Energy and Power Question 5 English

AP EAPCET 2022 - 5th July Morning Shift
8

A block of mass 50 kg is pulled with a constant speed of $$4 \mathrm{~ms}^{-1}$$ across a horizontal floor by an applied force of 500 N directed $$30^{\circ}$$ above the horizontal. The rate at which the force does work on the block in watt is

AP EAPCET 2022 - 5th July Morning Shift
9

A ball of mass 300 g is dropped from a height 10 m above a sandy ground. On reaching the ground, it penetrates through a distance 1.5 m in sand and finally stops. The average resistance offered by the sand to oppose the motion is (acceleration due to gravity $$=10 \mathrm{~ms}^{-2}$$)

AP EAPCET 2022 - 4th July Evening Shift
10

A mass of 1 kg falls from a height of 1 m and lands on a massless platform supported by a spring having spring constant $$15 \mathrm{~Nm}^{-1}$$ as shown in the figure. The maximum compression of the spring is (acceleration due to gravity $$=10 \mathrm{~ms}^{-2}$$)

AP EAPCET 2022 - 4th July Morning Shift Physics - Work, Energy and Power Question 8 English

AP EAPCET 2022 - 4th July Morning Shift
11

A bead of mass 400 g is moving along a straight line under a force that delivers a constant power 1.2 W to the bead. If the bead is initially at rest, the speed it attains after 6 s in $$\mathrm{ms}^{-1}$$

AP EAPCET 2022 - 4th July Morning Shift
12

The range of a projectile is 100 m. Its kinetic energy will be maximum after covering a distance of

AP EAPCET 2021 - 20th August Morning Shift
13

When a force F = 17 $$-$$ 2x + 6x$$^2$$N acts on a body of mass 2 kg and displaces it from x = 0 m to x = 8 m, the work done is

AP EAPCET 2021 - 20th August Morning Shift
14

A rifle bullet loses $$\left(\frac{1}{25}\right)$$th of its velocity in passing through a plank. The least number of such planks required just to stop the bullet is

AP EAPCET 2021 - 20th August Morning Shift
15

A uniform chain has a mass m and length $$l$$. It is held on a frictionless table with one-sixth of its length hanging over the edge. The work done in just pulling the hanging part back on the table is

AP EAPCET 2021 - 20th August Morning Shift
16

What is the shape of the graph between speed and kinetic energy of a body?

AP EAPCET 2021 - 19th August Evening Shift
17

A quarter horse power motor runs at a speed of 600 rpm. Assuming 60% efficiency, the work done by the motor in one rotation is

AP EAPCET 2021 - 19th August Evening Shift
18

A body of mass 8 kg, under the action of a force, is displaced according to the equation, $$s=\frac{t^2}{4}$$ m, where t is the time. Find the work done by the force in the first 4 s.

AP EAPCET 2021 - 19th August Morning Shift
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