Home
E-Books
Jobs
News
Results
Competition Exams
Admissions
Generate Test
Make Quiz
mcqs of
,
1 : When force makes 60° angle with displacement 'd', the work done will be:
1
:
Fd
2
:
Fd/2
3
:
0.866 Fd
4
:
Fd/3
2 : If 50 kg crate is pushed through 2m with 50 N force, the work done is:
1
:
100 J
2
:
245 J
3
:
150 J
4
:
200 J
3 : The ratio of dimensions of K.E and power is:
1
:
1:1
2
:
[T]:1
3
:
1:[T]
4
:
[M]:[T]
4 : 6 joule of work done in 3 seconds equals power of:
1
:
2 watt
2
:
6 watt
3
:
3 watt
4
:
18 watt
5 : Absolute P.E at infinite height w.r.t earth is:
1
:
Zero
2
:
Negative
3
:
Minimum
4
:
Virtual
6 : Which one is a conservative force:
1
:
Elastic Spring Force
2
:
Frictional Force
3
:
Air Resistance
4
:
Momentum
7 : Kilowatt-hour is unit of:
1
:
Energy
2
:
Power
3
:
Impulse
4
:
Tension
8 : When force is parallel to displacement, the work done is:
1
:
Minimum
2
:
Maximum
3
:
Infinity
4
:
Varies
9 : The area under the curve of force-displacement graph represents:
1
:
Force
2
:
Work
3
:
Power
4
:
Displacement
10 : The value of Escape Velocity for Earth is:
1
:
11.2 × 10³ m/s
2
:
11.6 × 10³ m/s
3
:
11.5 × 10³ m/s
4
:
12 × 10³ m/s
11 : Escape velocity on a planet with same mass but 1/4 radius of Earth is:
1
:
22.4 km/s
2
:
5.6 km/s
3
:
11.2 km/s
4
:
44.8 km/s
12 : If mass is doubled, escape velocity becomes:
1
:
Same (11 km/s)
2
:
5.5 km/s
3
:
22 km/s
4
:
44 km/s
13 : If momentum equals kinetic energy numerically, speed is:
1
:
2 m/s
2
:
1 m/s
3
:
4 m/s
4
:
8 m/s
14 : Gravitational P.E. is always measured relative to:
1
:
an arbitrary reference point
2
:
minimum P.E.
3
:
negative P.E.
4
:
Earth's surface
15 : When moving a body above Earth's surface, change in P.E is:
1
:
Positive
2
:
Negative
3
:
Zero
4
:
Infinity
16 : 1 kg mass is actually energy (E=mc²):
1
:
9 × 10¹⁶ J
2
:
3 × 10⁸ J
3
:
9 × 10⁸ J
4
:
3 × 10¹⁶ J
17 : The unit of energy is same as:
1
:
both work and torque
2
:
torque
3
:
work
4
:
power
18 : If 5N force does 25J work over 10m, the angle is:
1
:
60°
2
:
0°
3
:
30°
4
:
90°
19 : For freely falling body with friction:
1
:
Loss in P.E. > Gain in K.E.
2
:
Loss in P.E. = Gain in K.E.
3
:
Loss in P.E. < Gain in K.E.
4
:
None of these
20 : Power is equal to the dot product of force and:
1
:
Velocity
2
:
Acceleration
3
:
Displacement
4
:
Position vector
21 : 1 kg mass has 1 J P.E at height of:
1
:
0.102 m
2
:
1 m
3
:
98 m
4
:
32 m
22 : Work is negative when:
1
:
θ > 90°
2
:
work is always positive
3
:
θ < 90°
4
:
θ = 90°
23 : A 3000 J battery running a 2W motor lasts for:
1
:
25 minutes
2
:
1500 minutes
3
:
100 minutes
4
:
50 minutes
24 : Above Earth's surface, gravitational force:
1
:
varies inversely with square of distance
2
:
remains constant
3
:
becomes zero
4
:
varies directly with square of distance
25 : The escape velocity relation is:
1
:
vₑ = √(2gR)
2
:
vₑ = gR
3
:
vₑ = 2gR
4
:
vₑ = √(gR)
26 : Rate of doing work is called:
1
:
Power
2
:
Energy
3
:
Density
4
:
Force
27 : Energy consumed by 40W bulb in 2 seconds is:
1
:
80 J
2
:
0.02 J
3
:
30 J
4
:
120 J
28 : Iron (30kg) and Aluminium (10.5kg) spheres dropped from cliff have identical:
1
:
accelerations
2
:
momentums
3
:
potential energies
4
:
kinetic energies
29 : Mass is concentrated form of:
1
:
Energy
2
:
Inertia
3
:
Plasma
4
:
Charge
30 : A 6W lamp gives out how much energy in 2 minutes?
1
:
720 J
2
:
12 J
3
:
20 J
4
:
3 J
31 : Kinetic energy acquired under constant force is:
1
:
independent of m
2
:
proportional to m
3
:
proportional to 1/√m
4
:
proportional to 1/m
32 : Original source of energy for biomass is:
1
:
Sun
2
:
Earth
3
:
Moon
4
:
Star
33 : 1 kWh equals:
1
:
3.6 MJ
2
:
3.6×10³ J
3
:
4.6 MJ
4
:
2.6 MJ
34 : When a ball is thrown vertically upward, which force is conservative?
1
:
Gravity
2
:
Air resistance
3
:
Friction between ball and air
4
:
Contact force with hand
35 : The dimensions of K.E are:
1
:
ML²T⁻²
2
:
MLT
3
:
ML⁻²T²
4
:
none
36 : Escape velocity from Earth is:
1
:
11.2 km/s
2
:
1.1 km/s
3
:
1.1 cm/s
4
:
2.2 km/s
37 : Maximum work occurs at angle:
1
:
0°
2
:
90°
3
:
45°
4
:
30°
38 : Non-renewable energy source:
1
:
Coal
2
:
Wind
3
:
Biomass
4
:
Sunlight
39 : The maximum speed of a child on a swing (height varies from 0.5m to 1.5m) is approximately:
1
:
4.4 m/s
2
:
1.5 m/s
3
:
9.8 m/s
4
:
Depends upon child's mass
40 : Which represents greater work?
1
:
+200 J
2
:
+100 J
3
:
-100 J
4
:
-1000 J
41 : According to work-energy principle, work done equals:
1
:
change in kinetic energy
2
:
change in potential energy
3
:
zero
4
:
sum of K.E. and P.E.
42 : 60W bulb energy in 2 minutes:
1
:
7200 J
2
:
72 kJ
3
:
720 J
4
:
72000 J
43 : One Watt hour is equal to:
1
:
3.6 kJ
2
:
3.6 MJ
3
:
36 kJ
4
:
36 MJ
44 : A body at rest may have:
1
:
energy
2
:
speed
3
:
velocity
4
:
momentum
45 : Base unit kg·m²·s⁻³ measures:
1
:
Power
2
:
Weight
3
:
Pressure
4
:
Work
46 : 500kg rocket at constant 3000m/s produces power:
1
:
0 kW (since no acceleration)
2
:
1500 kW
3
:
6 kW
4
:
0.16 kW
47 : Gravity does zero work when body moves:
1
:
Horizontally
2
:
Vertically
3
:
At 60° with vertical
4
:
At 45° with horizontal
Chapter 4 : Work, Energy and Power
Physics 11th MCQs || Ilam Ghar
Physics 11th
