11th class Physics chapter 4 online mcq test with answers for ICS part 1 Physics chapter 4(Work and Energy)

Question # 1

Power can be defined as the scalar product of.

force and displacemnt
A
Force and velocity
B
Force and time
C
Force and mass
D

Question # 2

A force of 10 N is rquirired to overcome road friction and air resistanc in propelling an automobile at 30 m/sec. power develped by the engine.

600 W
A
400 W
B
300 W
C
500 W
D

Question # 3

Gravity performs zero work when body moves

Vertically
A
Horizontally
B
At 60% with vertical
C
At 45% with horizontal
D

Question # 4

A body rest may have.

Speed
A
Energy
B
Velocity
C
Momentum
D

Question # 5

A field in which the work done in moving a body along a closed path is zero known as.

Conservative field
A
Nuclear field
B
Magnetic field
C
Electric field
D

Question # 6

Which one of the folloiwng is/are correct.

Work is positive if 0< 90^o
A
Work is 0 if θ 90^o
B
Work is negative if θ 90^o
C
All of these
D

Question # 7

If the velocity of the body becomes double and mass become half thenints K.E.

Becomes double
A
Beocmes for time
B
In halved
C
Becomes eight time
D

Question # 8

Work done on a body for increasing velocity results in.

Change in K.E.
A
Change in gravitational P.E.
B
Change in electric P.E.
C
All
D

Question # 9

The consumption of eergy by a 60 watt bulb in 2 secinds is

130 J
A
120 J
B
160 j
C
0.02 J
D

Question # 10

The height above the gound of a child on a swing varies form 0.5 m of his lowest point to 1.5 m at his highst point. The maximum speed of the child is approximatley.

1.5 ms -1
A
4.4 ms-1
B
9.8 ms -1
C
Depends upon child's mass
D

Question # 11

The dimension of power

[ML2 T-3]
A
[ML-1T-1]
B
[ML2T2]
C
[ML-2T-4]
D

Question # 12

Power of lamp is 6 W. How much energy does a lamp give out in 2 min?

12 J
A
720 J
B
20 J
C
3 J
D

Question # 13

Two bodies A and B of mass 1 kg and 2 kg respectively have same momentum. Which one has greater KE.

Cannot be determined
A
A
B
B
C
Both hae the same K.E.
D

Question # 14

If P = pressure, Deltat V = change in volume, P Delta V represents

Work
A
Density
B
Power
C
Temperature
D

Question # 15

Absolute P.E. of a body of mass"m" at a distance"r" from earth centre is.

[-GM/r]
A
- Gr/ M
B
-Gmr
C
GmM /r
D

Question # 16

Which of the following is non conservative force.

Elastic spring force
A
Electric force
B
Gravitational force
C
Tension in string
D

Question # 17

An iron sphere whose mass is 30 kg has the same diameter as an aluminium sphere whose mass is 10.5 kg. The spheres are simultaneously dropped form a cliff. When they are 10 m fromt he gorund, they have identical.

Accelerations
A
Momentums
B
Potential engergies
C
Kinetic energies
D

Sr.#	Question	Answer
1	Which of the following is non conservative force.	A. Elastic spring force B. Electric force C. Gravitational force D. Tension in string
2	When the force is parallel to the direction of motionof the body the work done is.	A. Minimum B. Maximum C. Infinity D. Zero
3	1 kilowatt is equal=	A. 1000J/S B. 106 Watt C. 0.1 x 10 ² watt D. 6.25 x 10 ²⁵ J
4	If the velocity of the body becomes double and mass become half thenints K.E.	A. Becomes double B. Beocmes for time C. In halved D. Becomes eight time
5	Which one of the folloiwng is/are correct.	A. Work is positive if 0< 90^o B. Work is 0 if θ 90^o C. Work is negative if θ 90^o D. All of these
6	If a body mass 2 kg is raised verticaly through 2 m then the work done will be.	A. 50 J B. -39.2 J C. 35 J D. 40 J
7	A force of 10 N is rquirired to overcome road friction and air resistanc in propelling an automobile at 30 m/sec. power develped by the engine.	A. 600 W B. 400 W C. 300 W D. 500 W
8	The height above the gound of a child on a swing varies form 0.5 m of his lowest point to 1.5 m at his highst point. The maximum speed of the child is approximatley.	A. 1.5 ms -1 B. 4.4 ms-1 C. 9.8 ms -1 D. Depends upon child's mass
9	Absolute P.E. of a body of mass"m" at a distance"r" from earth centre is.	A. [-GM/r] B. - Gr/ M C. -Gmr D. GmM /r
10	1 kilowatt is equal =	A. 1000 J /s B. 106 watt C. 0.1 x 10³ Watt D. 6.25 x 10 ^{25 Watt}

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Power can be defined as the scalar product of.

A force of 10 N is rquirired to overcome road friction and air resistanc in propelling an automobile at 30 m/sec. power develped by the engine.

Gravity performs zero work when body moves

A body rest may have.

A field in which the work done in moving a body along a closed path is zero known as.

Which one of the folloiwng is/are correct.

If the velocity of the body becomes double and mass become half thenints K.E.

Work done on a body for increasing velocity results in.

The consumption of eergy by a 60 watt bulb in 2 secinds is

The height above the gound of a child on a swing varies form 0.5 m of his lowest point to 1.5 m at his highst point. The maximum speed of the child is approximatley.

The dimension of power

Power of lamp is 6 W. How much energy does a lamp give out in 2 min?

Two bodies A and B of mass 1 kg and 2 kg respectively have same momentum. Which one has greater KE.

If P = pressure, Deltat V = change in volume, P Delta V represents

Absolute P.E. of a body of mass"m" at a distance"r" from earth centre is.

Which of the following is non conservative force.

An iron sphere whose mass is 30 kg has the same diameter as an aluminium sphere whose mass is 10.5 kg. The spheres are simultaneously dropped form a cliff. When they are 10 m fromt he gorund, they have identical.

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