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11th Physics Weekly Test - 3 ( Work, Energy and Power )

MABS Institution

11th Physics Weekly Test - 3 ( Work, Energy and Power )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

A moving body of mass m and velocity 3 km/hour collides with a rest body of mass 2m and sticks to it. Now the combined mass starts to move. What will be the combined velocity?

3 km/hour
4 km/hour
1 km/hour
2 km/hour

Non-conservative force is

frictional force
viscous force
air resistance
all the above

An iron sphere of mass 8 kg has the same diameter as a copper sphere of mass 4 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same

acceleration
momenta
Potential Energy
Kinetic Energy

A particle is projected making an angle of 45° with horizontal having kinetic energy K. The kinetic energy at highest point will be

\(\frac{K}{\sqrt 2}\)
\(\frac{K}{2}\)
2K
k

The work done by the goal keeper catches the ball coming towards him by applying a force is

positive
negative
zero
infinity

The energy possessed by a body by its state of strain is called as:

kinetic energy
mechanical energy
potential energy
none

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

-0.5 rns^-1 and 0.3 ms^-1
0.5 ms-1 and -0.3 ms^-1
-0.3 ms^-1 and 0.5ms^-1
0.3 ms^-1 and 0.5 ms^-1

How much water it pump 2 kW can raise in one minute to a height of 10 m? (take g = 10 m/s²)

1000 litres
1200 litres
100 litres
2000 litres

If the potential energy of the particle is \(\alpha -\frac { \beta }{ 2 } { x }^{ 2 }\) then force experienced by the particle is

F=\(\frac { \beta }{ 2 } { x }^{ 2 }\)
F=βx
F=-βx
F=-\(\frac { \beta }{ 2 } { x }^{ 2 }\)

Conservative force is

electrostatic force
magnetic force
gravitational force
all the above

If the velocity of separation is equal to the velocity of approach, then the collision is

conservative force
non conservative force
gravitational force
electrostatic force

For elastic collision, coefficient of restitution is

0
1
0 < e < 1
\(\infty \)

A mass of 0.5 kg moving with a speed of 1.5 m/s on a horizontal smooth surface, collides with a nearly weightless spring of force constant k = 50 N/m. The maximum compression of the spring would be

0.15 m
0.12m
1.5 m
0.5 m

A particle of mass m₁ is moving with a velocity v, and another of mass m₂is moving with velocity v₂ Both of them have the some momentum but their kinetic energies are E₁ and E₂ respectively. If =m₁ > m₂the

E₁<E₂
\(\frac{E_1}{E_2}=\frac{m_1}{m_2}\)
E₁>E₂
E₁=E₂

A ball whose Kinetic Energy is E is projected at an angle of 45° to the horizontal. The kinetic energy of the ball at the highest point of its flight will be

E
\(\frac{E}{\sqrt2}\)
\(\frac{E}{2}\)
zero

Elastic potential energy possessed by a spring is

\(\frac { 1 }{ 2 } m{ v }^{ 2 }\)
mgh
\(\frac { 1 }{ 2 } k{ x }^{ 2 }\)
kx²

A man standing on a horizontal platform holds a heavy object in air:

when he moves on the horizontal platform, he does negative work
when he as well as platform moves, he does positive work
when he as well as platform moves, he does negative work and positive work on the table so that total work is zero
none of these

Two equal masses m₁ and m₂ moving along the same straight line with velocities + 3 m/s and -5 m/s respectively collide elastically. Their velocities after the collision will be respectively

- 4 m/s and +4 m/s
+4 m/s for both
- 3 m/s and +5 m/s
- 5 m/s and + 3 m/s

Two springs of spring constants k₁ and k₂(k₁ > k₂)· If they are stretched by the same force then (u₁ u₂ are potential energy of the springs) is

u₁ > u₂
u₂ > u₁
u₁ = u₂
u₁ \(\ge \) u₂

A bullet hits and gets embedded in a solid, block resting on a frictionless surface. In this process which is correct?

only momentum is conserved
both momentum and energy are conserved
only kinetic energy is conserved
neither momentum nor energy are conserved

Dimensional formula for work done is

MLT^-1
ML²T²
M^-1L^-1T^-2
ML²T^-2

A ball is allowed to fall from a height of 20 m.If there is 40% loss of energy due to impact, then after one impact the ball will rise up to a height of

6m
12m
2m
10m

When a particle is moving in vertical circle

its radial and tangential acceleration both are constant
its radial and tangential acceleration both are varying
its radial is constant but tangential acceleration is varying
its radial and is varying but tangential acceleration is constant

Two bodies A and having masses in the ratio 5:1 are dropped from the same height. Then the ratio of their momenta just before they hit the ground is

1: 5
5:1
\(1:\sqrt 5\)
1: 10

A shell of mass 200 gm is ejected from a gun of mass 4 kg by an explosion that generates 1.05 kJ of energy. The initial velocity of the shell is

40ms^-1
120ms^-1
100ms^-1
80ms^-1

If the momentum of a body increases by 25% its kinetic energy will increase by

25%
50%
125%
56.25%

For inelastic collision co-efficient of restitution is

0
1
0 < e < 1
\(\infty \)

If the angle between force and displacement is acute then the work done is

positive
negative
zero
maximum

Which of the following is not a perfectly inelastic collision?

Striking of two glass bulbs
Bullet striking a bag and sand
An electron captured by a proton
A man jumping onto a moving cart

A child is sitting on a swing. Its minimum and maximum heights from the ground 0.75 m and 2 m respectively, its maximum speed will be

10 m/s
5 m/s
8 m/s
15 m/s

A body is falling from a height h. After it has fallen a height \(\frac{h}{2}\) it will possess

only Potential Energy
only Kinetic Energy
half potential and half kinetic energy
more kinetic and less potential energy

A particles along y axis from y = 1 m to y = 3 m under the influence of a force given by f(y)=6-2y+3y² then the work done is,

48 J
50 J
-48 J
- 50 J

The potential energy of a system increases if work is done

upon the system by a non-conservative force
upon the system by a conservative force
By a system against conservative force
By a system against non conservative force

Same retarding force is applied to stop the train in certain distance. When the speed is doubled, how is this distance changed?

Remain same
Gets doubled
Gets doubled
Gets four times

1 erg is equivalent to

10^-7 J
1.6 x 10^-19 J
4.186 J
3.6 x 10^-6J

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