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mcqs of
,
1 : The magnitude of rectangular components of a vector are equal if its angle with the x-axis is:
1
:
30°
2
:
45°
3
:
60°
4
:
90°
2 : Resultant of two perpendicular vectors each of magnitude A is:
1
:
A
2
:
√2A
3
:
A√2
4
:
A²
3 : If AB sinθ = AB cosθ, then the angle between A and B is:
1
:
30°
2
:
45°
3
:
60°
4
:
180°
4 : A force of 10 N makes an angle of 30° with y-axis. The magnitude of x-component will be:
1
:
5 N
2
:
8.66 N
3
:
10 N
4
:
Zero
5 : The magnitude of dot and cross product of two vectors are equal when angle between them is:
1
:
0°
2
:
45°
3
:
90°
4
:
270°
6 : Dot product of two antiparallel vectors A and B is:
1
:
AB cosθ
2
:
AB
3
:
0
4
:
-AB
7 : If A × B = 0, then the angle between the vectors is:
1
:
90°
2
:
45°
3
:
0°
4
:
None of these
8 : The resultant of two forces of magnitude 5 N and 10 N cannot be:
1
:
4 N
2
:
13 N
3
:
9 N
4
:
6 N
9 : The resultant of two forces 30 N and 40 N acting parallel to each other is:
1
:
30 N
2
:
40 N
3
:
70 N
4
:
10 N
10 : If A × B points along positive z-axis, the vectors A and B must lie in:
1
:
YZ-plane
2
:
XZ-plane
3
:
XY-plane
4
:
No plane
11 : The scalar product of two vectors is maximum when they are:
1
:
Parallel
2
:
Perpendicular
3
:
Null
4
:
Antiparallel
12 : The force of 15 N makes an angle of 90° with x-axis, its y-component is:
1
:
15 N
2
:
Zero N
3
:
30 N
4
:
45 N
13 : If |A| = |B| and angle between them is 60°, then A · B is:
1
:
6
2
:
12
3
:
24
4
:
None of these
14 : A bullet shot straight up returns to its starting point in 10 sec. The initial speed was:
1
:
9.8 m/s
2
:
24.5 m/s
3
:
49 m/s
4
:
98 m/s
15 : B · B is equal to:
1
:
B²
2
:
1
3
:
Zero
4
:
B
16 : The velocity of a free-falling body just before hitting the ground is 9.8 m/s, the height through which it fell is:
1
:
98 m
2
:
19.6 m
3
:
4.9 m
4
:
9.8 m
17 : Dot product of vector A with itself is:
1
:
Zero
2
:
2A
3
:
A²
4
:
A
18 : Scalar product of force and velocity is:
1
:
Work
2
:
Power
3
:
Energy
4
:
Acceleration
19 : Minimum number of unequal forces whose vector sum can be zero are:
1
:
5
2
:
4
3
:
3
4
:
2
20 : The equations of motion are not useful for objects moving with:
1
:
Uniform velocity
2
:
Uniform acceleration
3
:
Variable acceleration
4
:
Variable velocity
21 : The value of 'g' at the center of the Earth is:
1
:
Infinite
2
:
2g
3
:
3g
4
:
Zero
22 : The distance covered by a freely falling body in the first 2 seconds when its initial velocity was zero is:
1
:
9.8 m
2
:
39.2 m
3
:
19.6 m
4
:
4.9 m
23 : If a body is moving with constant velocity of 10 m/s toward west, then its acceleration is:
1
:
1 m/s²
2
:
10 m/s²
3
:
30 m/s²
4
:
Zero
24 : Projection of B on A is:
1
:
A cosθ
2
:
B sinθ
3
:
A sinθ
4
:
B cosθ
25 : The vector A has components Az and Ay, the magnitude of Ax is given by:
1
:
A - Ay
2
:
(A² - Ay²)¹ᐟ²
3
:
(A - Ay)¹ᐟ²
4
:
[A² - A]¹ᐟ²
26 : If two non-zero vectors A and B are parallel to each other, then:
1
:
A · B = 0
2
:
A · B = AB
3
:
|A × B| = AB
4
:
|A × B| = A · B
27 : The range of projectile is same for:
1
:
0°, 45°
2
:
35°, 55°
3
:
15°, 60°
4
:
30°, 75°
28 : The range of a projectile becomes half of the maximum range at angle of projection:
1
:
15°
2
:
25°
3
:
45°
4
:
72°
29 : The projectile gains its maximum height at an angle of:
1
:
0°
2
:
45°
3
:
60°
4
:
90°
30 : The rate of change of momentum is:
1
:
Force
2
:
Impulse
3
:
Acceleration
4
:
Power
31 : The range of projectile is same for two angles which are mutually:
1
:
Perpendicular
2
:
Supplementary
3
:
Complementary
4
:
270°
32 : The angle at which magnitude of dot product becomes equal to cross product:
1
:
65°
2
:
45°
3
:
76°
4
:
30°
33 : The horizontal component of velocity of projectile:
1
:
Increases
2
:
Decreases
3
:
Remains same
4
:
Decreases then increases
34 : A typical rocket consumes fuel at rate of:
1
:
10000 kg/s
2
:
1000 kg/s
3
:
100 kg/s
4
:
100000 kg/s
35 : The horizontal range of projectile at 30° with horizontal is the same as that at an angle of:
1
:
45°
2
:
60°
3
:
90°
4
:
120°
36 : The angle of projection for which its maximum height and horizontal range are equal:
1
:
45°
2
:
60°
3
:
66°
4
:
76°
37 : Impulse has the same unit as that of:
1
:
Force
2
:
Energy
3
:
Mass
4
:
Linear momentum
38 : As rocket moves upward during its journey, its acceleration:
1
:
Increases
2
:
Decreases
3
:
Remains same
4
:
It moves with uniform velocity
39 : When a rocket moves upward its acceleration:
1
:
Increases
2
:
Decreases
3
:
Becomes zero
4
:
Remains constant
40 : The scalar product of two vectors is maximum if they are:
1
:
Perpendicular
2
:
Parallel
3
:
At 30°
4
:
At 45°
41 : Elastic collision involves:
1
:
Loss of energy
2
:
Gain of energy
3
:
No gain, no loss of energy
4
:
No relation between energy and elastic collision
42 : Rocket equation is given as:
1
:
a = M/mv
2
:
a = Mv/m
3
:
a = mv/M
4
:
a = m/Mv
43 : SI unit of impulse is:
1
:
kg·m/s²
2
:
N·m
3
:
N·s
4
:
N·m²
44 : The rate of change in momentum of a body is equal to:
1
:
Displacement
2
:
Velocity
3
:
Acceleration
4
:
Applied force
45 : If a force of 10 N acts on a body of mass 5 kg for one second, then its rate of change of momentum will be:
1
:
10 kg m/s²
2
:
50 kg m/s²
3
:
5 kg m/s²
4
:
2 kg m/s²
46 : At what speed the momentum and kinetic energy of a body have the same numerical value?
1
:
1 m/s
2
:
2 m/s
3
:
4 m/s
4
:
8 m/s
47 : As the rocket moves upward during its job, its acceleration goes on:
1
:
Increasing
2
:
Decreasing
3
:
Remains same
4
:
It moves with uniform velocity
48 : The acceleration at the top of a trajectory of projectile is:
1
:
Maximum
2
:
Minimum
3
:
Zero
4
:
g
49 : For a typical rocket, how much mass is in the form of fuel (at 4000 m/s speed)?
1
:
60%
2
:
50%
3
:
80%
4
:
100%
Physics 11th MCQs || Ilam Ghar
Chapter 2 : Force and Motion
Physics 11th
