JEE Physics Laws Of Motion MCQs Set 04

Multiple Choice Questions (MCQs) for JEE Physics: Laws Of Motion

Review structured MCQ sets for JEE Physics Laws Of Motion. Built according to official JEE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Practice Laws Of Motion MCQs for JEE Physics

View or download the dedicated Laws Of Motion MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Physics evaluations.

Multiple Choice Questions

Question 1: A particle is in a straight line motion with uniform velocity. A force is not required
(a) To increase the speed
(b) To decrease the speed
(c) To maintain the same speed
(d) To change the direction
Show Answer & Explanation

Answer: (c) To maintain the same speed

Explanation:
1. By Newton's first law a body in uniform motion continues so unless a net force acts.
2. Force is needed only to change the speed or the direction, not to maintain the same speed.

Teacher's Note:
1. F
2. o
3. r
4. c
5. e
6.
7. c
8. h
9. a
10. n
11. g
12. e
13. s
14.
15. v
16. e
17. l
18. o
19. c
20. i
21. t
22. y
23. ,
24.
25. i
26. t
27.
28. d
29. o
30. e
31. s
32.
33. n
34. o
35. t
36.
37. s
38. u
39. s
40. t
41. a
42. i
43. n
44.
45. i
46. t
47. .
48.
49. C
50. o
51. n
52. s
53. t
54. a
55. n
56. t
57.
58. v
59. e
60. l
61. o
62. c
63. i
64. t
65. y
66.
67. m
68. e
69. a
70. n
71. s
72.
73. z
74. e
75. r
76. o
77.
78. n
79. e
80. t
81.
82. f
83. o
84. r
85. c
86. e
87. .

Question 2: A 5 kg mass is accelerated from rest to 60 m/s in 1 s. The force acting on it is
(a) \( 5\times60\ \text{N} \)
(b) \( \frac{5}{60}\times981\ \text{N} \)
(c) \( 60^2\times5^2\ \text{N} \)
(d) \( \frac52\times60^2\times981\ \text{N} \)
Show Answer & Explanation

Answer: (a) \( 5\times60\ \text{N} \)

Explanation:
1. Acceleration \( a=\frac{60-0}{1}=60\ \text{m/s}^2 \).
2. Force \( F=ma=5\times60=300\ \text{N} \), which is option (a).

Teacher's Note:
1. U
2. s
3. e
4.
5. F
6.
7. =
8.
9. m
10. a
11.
12. w
13. i
14. t
15. h
16.
17. t
18. h
19. e
20.
21. a
22. c
23. c
24. e
25. l
26. e
27. r
28. a
29. t
30. i
31. o
32. n
33.
34. f
35. o
36. u
37. n
38. d
39.
40. f
41. r
42. o
43. m
44.
45. c
46. h
47. a
48. n
49. g
50. e
51.
52. i
53. n
54.
55. v
56. e
57. l
58. o
59. c
60. i
61. t
62. y
63.
64. o
65. v
66. e
67. r
68.
69. t
70. i
71. m
72. e
73. .
74.
75. D
76. o
77.
78. n
79. o
80. t
81.
82. m
83. i
84. x
85.
86. i
87. n
88.
89. 9
90. 8
91. 1
92. ,
93.
94. w
95. h
96. i
97. c
98. h
99.
100. b
101. e
102. l
103. o
104. n
105. g
106. s
107.
108. t
109. o
110.
111. C
112. G
113. S
114.
115. u
116. n
117. i
118. t
119. s
120. .

Question 3: A body of mass 40 g is moving with a constant velocity of 2 cm/s on a horizontal frictionless table. The force on the body (in dynes) is
(a) Zero
(b) 39200
(c) 160
(d) 80
Show Answer & Explanation

Answer: (a) Zero

Explanation:
1. Velocity is constant, so acceleration is zero.
2. Net force = ma = 0. The table is frictionless, so no horizontal force is needed.

Teacher's Note:
1. C
2. o
3. n
4. s
5. t
6. a
7. n
8. t
9.
10. v
11. e
12. l
13. o
14. c
15. i
16. t
17. y
18.
19. a
20. l
21. w
22. a
23. y
24. s
25.
26. m
27. e
28. a
29. n
30. s
31.
32. z
33. e
34. r
35. o
36.
37. n
38. e
39. t
40.
41. f
42. o
43. r
44. c
45. e
46. .
47.
48. T
49. h
50. e
51.
52. n
53. u
54. m
55. b
56. e
57. r
58. s
59.
60. g
61. i
62. v
63. e
64. n
65.
66. a
67. r
68. e
69.
70. d
71. i
72. s
73. t
74. r
75. a
76. c
77. t
78. o
79. r
80. s
81. .

Question 4: A body of mass 2 kg moving on a horizontal surface with an initial velocity of 4 m/s comes to rest after 2 s. To keep this body moving on the same surface with a velocity of 4 m/s, the force required is
(a) 8 N
(b) 4 N
(c) Zero
(d) 2 N
Show Answer & Explanation

Answer: (b) 4 N

Explanation:
1. Deceleration due to friction \( a=\frac{4}{2}=2\ \text{m/s}^2 \).
2. Friction force \( f=ma=2\times2=4\ \text{N} \).
3. To maintain constant velocity the applied force must balance friction, so F = 4 N.

Teacher's Note:
1. A
2. t
3.
4. c
5. o
6. n
7. s
8. t
9. a
10. n
11. t
12.
13. v
14. e
15. l
16. o
17. c
18. i
19. t
20. y
21.
22. t
23. h
24. e
25.
26. a
27. p
28. p
29. l
30. i
31. e
32. d
33.
34. f
35. o
36. r
37. c
38. e
39.
40. e
41. q
42. u
43. a
44. l
45. s
46.
47. t
48. h
49. e
50.
51. o
52. p
53. p
54. o
55. s
56. i
57. n
58. g
59.
60. f
61. r
62. i
63. c
64. t
65. i
66. o
67. n
68. .
69.
70. F
71. i
72. n
73. d
74.
75. f
76. r
77. i
78. c
79. t
80. i
81. o
82. n
83.
84. f
85. r
86. o
87. m
88.
89. t
90. h
91. e
92.
93. s
94. t
95. o
96. p
97. p
98. i
99. n
100. g
101.
102. m
103. o
104. t
105. i
106. o
107. n
108. .

Question 5: Two bodies of masses 4 kg and 5 kg are acted upon by the same force. If the acceleration of the lighter body is 2 m/s², the acceleration of the heavier body is
(a) 4.2 m/s²
(b) 3.6 m/s²
(c) 2.4 m/s²
(d) 1.6 m/s²
Show Answer & Explanation

Answer: (d) 1.6 m/s²

Explanation:
1. Force \( F=4\times2=8\ \text{N} \).
2. Acceleration of the 5 kg body \( a=\frac{8}{5}=1.6\ \text{m/s}^2 \).

Teacher's Note:
1. F
2. o
3. r
4.
5. t
6. h
7. e
8.
9. s
10. a
11. m
12. e
13.
14. f
15. o
16. r
17. c
18. e
19. ,
20.
21. a
22. c
23. c
24. e
25. l
26. e
27. r
28. a
29. t
30. i
31. o
32. n
33.
34. i
35. s
36.
37. i
38. n
39. v
40. e
41. r
42. s
43. e
44. l
45. y
46.
47. p
48. r
49. o
50. p
51. o
52. r
53. t
54. i
55. o
56. n
57. a
58. l
59.
60. t
61. o
62.
63. m
64. a
65. s
66. s
67. .
68.
69. T
70. h
71. e
72.
73. h
74. e
75. a
76. v
77. i
78. e
79. r
80.
81. b
82. o
83. d
84. y
85.
86. m
87. u
88. s
89. t
90.
91. a
92. c
93. c
94. e
95. l
96. e
97. r
98. a
99. t
100. e
101.
102. l
103. e
104. s
105. s
106. .

Question 6: An object of mass 10 kg moves at a constant velocity of 10 m/s. A constant force then acts for 4 s on the object, giving it a speed of 2 m/s in the opposite direction. The acceleration produced is
(a) 3 m/s²
(b) −3 m/s²
(c) 0.3 m/s²
(d) −0.3 m/s²
Show Answer & Explanation

Answer: (b) −3 m/s²

Explanation:
1. Take the initial direction as positive: \( u=10,\ v=-2 \).
2. Acceleration \( a=\frac{v-u}{t}=\frac{-2-10}{4}=-3\ \text{m/s}^2 \).

Teacher's Note:
1. R
2. e
3. v
4. e
5. r
6. s
7. a
8. l
9.
10. o
11. f
12.
13. d
14. i
15. r
16. e
17. c
18. t
19. i
20. o
21. n
22.
23. m
24. e
25. a
26. n
27. s
28.
29. t
30. h
31. e
32.
33. f
34. i
35. n
36. a
37. l
38.
39. v
40. e
41. l
42. o
43. c
44. i
45. t
46. y
47.
48. i
49. s
50.
51. n
52. e
53. g
54. a
55. t
56. i
57. v
58. e
59. .
60.
61. T
62. h
63. e
64.
65. s
66. i
67. g
68. n
69.
70. o
71. f
72.
73. a
74. c
75. c
76. e
77. l
78. e
79. r
80. a
81. t
82. i
83. o
84. n
85.
86. s
87. h
88. o
89. w
90. s
91.
92. i
93. t
94.
95. o
96. p
97. p
98. o
99. s
100. e
101. s
102.
103. t
104. h
105. e
106.
107. i
108. n
109. i
110. t
111. i
112. a
113. l
114.
115. m
116. o
117. t
118. i
119. o
120. n
121. .

Question 7: The velocity acquired by a mass m in travelling a certain distance d starting from rest under the action of a constant force is directly proportional to
(a) \( \sqrt{m} \)
(b) \( m^0 \)
(c) \( \frac{1}{\sqrt m} \)
(d) \( m \)
Show Answer & Explanation

Answer: (c) \( \frac{1}{\sqrt m} \)

Explanation:
1. Work-energy theorem: \( Fd=\frac12mv^2 \).
2. So \( v=\sqrt{\frac{2Fd}{m}}\propto\frac{1}{\sqrt m} \).

Teacher's Note:
1. W
2. i
3. t
4. h
5.
6. F
7.
8. a
9. n
10. d
11.
12. d
13.
14. f
15. i
16. x
17. e
18. d
19. ,
20.
21. k
22. i
23. n
24. e
25. t
26. i
27. c
28.
29. e
30. n
31. e
32. r
33. g
34. y
35.
36. i
37. s
38.
39. f
40. i
41. x
42. e
43. d
44. ,
45.
46. s
47. o
48.
49. h
50. e
51. a
52. v
53. i
54. e
55. r
56.
57. b
58. o
59. d
60. i
61. e
62. s
63.
64. r
65. e
66. a
67. c
68. h
69.
70. l
71. o
72. w
73. e
74. r
75.
76. s
77. p
78. e
79. e
80. d
81. .
82.
83. S
84. p
85. e
86. e
87. d
88.
89. v
90. a
91. r
92. i
93. e
94. s
95.
96. a
97. s
98.
99. t
100. h
101. e
102.
103. i
104. n
105. v
106. e
107. r
108. s
109. e
110.
111. s
112. q
113. u
114. a
115. r
116. e
117.
118. r
119. o
120. o
121. t
122.
123. o
124. f
125.
126. m
127. a
128. s
129. s
130. .

Question 8: A ship of mass \( 3\times10^7 \) kg initially at rest is pulled by a force of \( 5\times10^4 \) N through a distance of 3 m. Neglecting friction, the speed of the ship at this moment is
(a) 3.0 m/s
(b) 1.5 m/s
(c) 0.1 m/s
(d) 2 m/s
Show Answer & Explanation

Answer: (c) 0.1 m/s

Explanation:
1. Work done \( =5\times10^4\times3=1.5\times10^5\ \text{J} \).
2. Equate to kinetic energy: \( \frac12(3\times10^7)v^2=1.5\times10^5 \).
3. So \( v^2=0.01 \) and v = 0.1 m/s.

Teacher's Note:
1. U
2. s
3. e
4.
5. t
6. h
7. e
8.
9. w
10. o
11. r
12. k
13. -
14. e
15. n
16. e
17. r
18. g
19. y
20.
21. t
22. h
23. e
24. o
25. r
26. e
27. m
28.
29. i
30. n
31. s
32. t
33. e
34. a
35. d
36.
37. o
38. f
39.
40. f
41. i
42. n
43. d
44. i
45. n
46. g
47.
48. t
49. i
50. m
51. e
52. .
53.
54. B
55. e
56.
57. c
58. a
59. r
60. e
61. f
62. u
63. l
64.
65. w
66. i
67. t
68. h
69.
70. p
71. o
72. w
73. e
74. r
75. s
76.
77. o
78. f
79.
80. t
81. e
82. n
83. .

Question 9: A balloon of mass M is descending with a constant acceleration g/3. When a mass m is released from the balloon it starts rising with the same acceleration g/3. The value of m is (assume the volume does not change)
(a) \( \frac{M}{2} \)
(b) \( \frac{M}{4} \)
(c) \( 4M \)
(d) \( 2M \)
Show Answer & Explanation

Answer: (a) \( \frac{M}{2} \)

Explanation:
1. Let the upthrust be B. While descending: \( Mg-B=M\frac g3 \), so \( B=\frac{2Mg}{3} \).
2. After releasing m, mass is M − m and it rises: \( B-(M-m)g=(M-m)\frac g3 \).
3. So \( \frac{2M}{3}=\frac43(M-m) \), giving \( M-m=\frac M2 \) and \( m=\frac M2 \).

Teacher's Note:
1. T
2. h
3. e
4.
5. u
6. p
7. t
8. h
9. r
10. u
11. s
12. t
13.
14. s
15. t
16. a
17. y
18. s
19.
20. t
21. h
22. e
23.
24. s
25. a
26. m
27. e
28.
29. b
30. e
31. c
32. a
33. u
34. s
35. e
36.
37. t
38. h
39. e
40.
41. v
42. o
43. l
44. u
45. m
46. e
47.
48. i
49. s
50.
51. u
52. n
53. c
54. h
55. a
56. n
57. g
58. e
59. d
60. .
61.
62. W
63. r
64. i
65. t
66. e
67.
68. N
69. e
70. w
71. t
72. o
73. n
74. '
75. s
76.
77. s
78. e
79. c
80. o
81. n
82. d
83.
84. l
85. a
86. w
87.
88. f
89. o
90. r
91.
92. b
93. o
94. t
95. h
96.
97. s
98. i
99. t
100. u
101. a
102. t
103. i
104. o
105. n
106. s
107.
108. a
109. n
110. d
111.
112. e
113. l
114. i
115. m
116. i
117. n
118. a
119. t
120. e
121.
122. B
123. .

Question 10: Gravel is dropped onto a conveyor belt at the rate of 0.5 kg/s. The extra force required in newton to keep the belt moving at 2 m/s is
(a) 1 N
(b) 2 N
(c) 4 N
(d) 0.5 N
Show Answer & Explanation

Answer: (a) 1 N

Explanation:
1. Extra force equals rate of change of momentum of the gravel: \( F=v\frac{dm}{dt} \).
2. F = 2 × 0.5 = 1 N.

Teacher's Note:
1. M
2. a
3. s
4. s
5.
6. i
7. s
8.
9. b
10. e
11. i
12. n
13. g
14.
15. a
16. d
17. d
18. e
19. d
20.
21. t
22. o
23.
24. t
25. h
26. e
27.
28. m
29. o
30. v
31. i
32. n
33. g
34.
35. s
36. y
37. s
38. t
39. e
40. m
41.
42. a
43. t
44.
45. c
46. o
47. n
48. s
49. t
50. a
51. n
52. t
53.
54. s
55. p
56. e
57. e
58. d
59. ,
60.
61. s
62. o
63.
64. F
65.
66. =
67.
68. v
69.
70. d
71. m
72. /
73. d
74. t
75. .
76.
77. T
78. h
79. e
80.
81. b
82. e
83. l
84. t
85.
86. s
87. p
88. e
89. e
90. d
91.
92. i
93. s
94.
95. k
96. e
97. p
98. t
99.
100. f
101. i
102. x
103. e
104. d
105. ,
106.
107. h
108. e
109. n
110. c
111. e
112.
113. n
114. o
115.
116. a
117. c
118. c
119. e
120. l
121. e
122. r
123. a
124. t
125. i
126. o
127. n
128.
129. t
130. e
131. r
132. m
133. .

Question 11: A block of metal weighing 2 kg is resting on a frictionless plane. It is struck by a jet releasing water at a rate of 1 kg/s with a speed of 5 m/s. The initial acceleration of the block will be
(a) 2.5 m/s²
(b) 5 m/s²
(c) 10 m/s²
(d) 15 m/s²
Show Answer & Explanation

Answer: (a) 2.5 m/s²

Explanation:
1. Force by the jet (water stops on striking) \( F=v\frac{dm}{dt}=5\times1=5\ \text{N} \).
2. Acceleration \( a=\frac{5}{2}=2.5\ \text{m/s}^2 \).

Teacher's Note:
1. A
2.
3. j
4. e
5. t
6.
7. t
8. h
9. a
10. t
11.
12. l
13. o
14. s
15. e
16. s
17.
18. a
19. l
20. l
21.
22. i
23. t
24. s
25.
26. m
27. o
28. m
29. e
30. n
31. t
32. u
33. m
34.
35. o
36. n
37.
38. t
39. h
40. e
41.
42. b
43. l
44. o
45. c
46. k
47.
48. e
49. x
50. e
51. r
52. t
53. s
54.
55. F
56.
57. =
58.
59. v
60.
61. d
62. m
63. /
64. d
65. t
66. .
67.
68. D
69. i
70. v
71. i
72. d
73. e
74.
75. b
76. y
77.
78. t
79. h
80. e
81.
82. b
83. l
84. o
85. c
86. k
87. '
88. s
89.
90. m
91. a
92. s
93. s
94.
95. f
96. o
97. r
98.
99. t
100. h
101. e
102.
103. a
104. c
105. c
106. e
107. l
108. e
109. r
110. a
111. t
112. i
113. o
114. n
115. .

Question 12: A ball weighing 10 g hits a hard surface vertically with a speed of 5 m/s and rebounds with the same speed. The ball remains in contact with the surface for 0.01 s. The average force exerted by the surface on the ball is
(a) 100 N
(b) 10 N
(c) 1 N
(d) 0.1 N
Show Answer & Explanation

Answer: (b) 10 N

Explanation:
1. Mass = 0.01 kg. Change in momentum \( =0.01\times5-(0.01\times(-5))=0.1\ \text{kg m/s} \).
2. Average force \( =\frac{0.1}{0.01}=10\ \text{N} \).

Teacher's Note:
1. R
2. e
3. b
4. o
5. u
6. n
7. d
8.
9. a
10. t
11.
12. e
13. q
14. u
15. a
16. l
17.
18. s
19. p
20. e
21. e
22. d
23.
24. d
25. o
26. u
27. b
28. l
29. e
30. s
31.
32. t
33. h
34. e
35.
36. m
37. o
38. m
39. e
40. n
41. t
42. u
43. m
44.
45. c
46. h
47. a
48. n
49. g
50. e
51. :
52.
53. Δ
54. p
55.
56. =
57.
58. 2
59. m
60. v
61. .
62.
63. C
64. o
65. n
66. v
67. e
68. r
69. t
70.
71. g
72. r
73. a
74. m
75. s
76.
77. t
78. o
79.
80. k
81. i
82. l
83. o
84. g
85. r
86. a
87. m
88. s
89.
90. f
91. i
92. r
93. s
94. t
95. .

Question 13: A player catches a ball of 200 g moving with a speed of 20 m/s. If the time taken to complete the catch is 0.5 s, the force exerted by the ball on the player's hand is
(a) 8 N
(b) 4 N
(c) 2 N
(d) 0
Show Answer & Explanation

Answer: (a) 8 N

Explanation:
1. Change in momentum \( =0.2\times20=4\ \text{kg m/s} \).
2. Force \( =\frac{4}{0.5}=8\ \text{N} \).

Teacher's Note:
1. T
2. h
3. e
4.
5. b
6. a
7. l
8. l
9.
10. i
11. s
12.
13. b
14. r
15. o
16. u
17. g
18. h
19. t
20.
21. t
22. o
23.
24. r
25. e
26. s
27. t
28. ,
29.
30. s
31. o
32.
33. Δ
34. p
35.
36. =
37.
38. m
39. v
40. .
41.
42. A
43.
44. l
45. o
46. n
47. g
48. e
49. r
50.
51. c
52. a
53. t
54. c
55. h
56. i
57. n
58. g
59.
60. t
61. i
62. m
63. e
64.
65. r
66. e
67. d
68. u
69. c
70. e
71. s
72.
73. t
74. h
75. e
76.
77. f
78. o
79. r
80. c
81. e
82. ,
83.
84. w
85. h
86. i
87. c
88. h
89.
90. i
91. s
92.
93. w
94. h
95. y
96.
97. p
98. l
99. a
100. y
101. e
102. r
103. s
104.
105. d
106. r
107. a
108. w
109.
110. t
111. h
112. e
113.
114. h
115. a
116. n
117. d
118.
119. b
120. a
121. c
122. k
123. .

Question 14: A tennis ball is dropped on the floor from a height of 20 m. It rebounds to a height of 5 m. The ball was in contact with the floor for 0.01 s. The average acceleration during the contact is (g = 10 m/s²)
(a) 3000 m/s²
(b) 2000 m/s²
(c) 1000 m/s²
(d) 500 m/s²
Show Answer & Explanation

Answer: (a) 3000 m/s²

Explanation:
1. Speed just before impact \( =\sqrt{2\times10\times20}=20\ \text{m/s} \) downward.
2. Speed just after impact \( =\sqrt{2\times10\times5}=10\ \text{m/s} \) upward.
3. Change in velocity = 10 − (−20) = 30 m/s, so \( a=\frac{30}{0.01}=3000\ \text{m/s}^2 \).

Teacher's Note:
1. T
2. r
3. e
4. a
5. t
6.
7. t
8. h
9. e
10.
11. t
12. w
13. o
14.
15. v
16. e
17. l
18. o
19. c
20. i
21. t
22. i
23. e
24. s
25.
26. w
27. i
28. t
29. h
30.
31. o
32. p
33. p
34. o
35. s
36. i
37. t
38. e
39.
40. s
41. i
42. g
43. n
44. s
45. .
46.
47. T
48. h
49. e
50.
51. c
52. h
53. a
54. n
55. g
56. e
57.
58. i
59. n
60.
61. v
62. e
63. l
64. o
65. c
66. i
67. t
68. y
69.
70. i
71. s
72.
73. t
74. h
75. e
76.
77. s
78. u
79. m
80.
81. o
82. f
83.
84. t
85. h
86. e
87.
88. t
89. w
90. o
91.
92. s
93. p
94. e
95. e
96. d
97. s
98. .

Question 15: For a body of mass 50 kg, the velocity-time graph is a straight line from the origin passing through the point (2 s, 2 m/s). The force acting on the body is
(a) 25 N
(b) 50 N
(c) 12.5 N
(d) 100 N
Show Answer & Explanation

Answer: (b) 50 N

Explanation:
1. Slope of the graph gives acceleration: \( a=\frac{2}{2}=1\ \text{m/s}^2 \).
2. F = ma = 50 × 1 = 50 N.

Teacher's Note:
1. T
2. h
3. e
4.
5. s
6. l
7. o
8. p
9. e
10.
11. o
12. f
13.
14. a
15.
16. v
17. -
18. t
19.
20. g
21. r
22. a
23. p
24. h
25.
26. i
27. s
28.
29. a
30. c
31. c
32. e
33. l
34. e
35. r
36. a
37. t
38. i
39. o
40. n
41. .
42.
43. A
44.
45. s
46. t
47. r
48. a
49. i
50. g
51. h
52. t
53.
54. l
55. i
56. n
57. e
58.
59. m
60. e
61. a
62. n
63. s
64.
65. c
66. o
67. n
68. s
69. t
70. a
71. n
72. t
73.
74. f
75. o
76. r
77. c
78. e
79. .

Question 16: A disc of mass 1.0 kg is kept floating horizontally in air by firing bullets of mass 0.05 kg each vertically at it, at the rate of 10 per second. If the bullets rebound with the same speed, the speed with which these are fired is
(a) 0.098 m/s
(b) 0.98 m/s
(c) 9.8 m/s
(d) 98.0 m/s
Show Answer & Explanation

Answer: (c) 9.8 m/s

Explanation:
1. Each bullet changes momentum by \( 2mv \), and 10 bullets strike per second.
2. Force \( =10\times2\times0.05\times v=v \) newton.
3. For floating, force = weight = 1.0 × 9.8 N, so v = 9.8 m/s.

Teacher's Note:
1. B
2. a
3. l
4. a
5. n
6. c
7. e
8.
9. t
10. h
11. e
12.
13. a
14. v
15. e
16. r
17. a
18. g
19. e
20.
21. f
22. o
23. r
24. c
25. e
26.
27. f
28. r
29. o
30. m
31.
32. t
33. h
34. e
35.
36. b
37. u
38. l
39. l
40. e
41. t
42. s
43.
44. a
45. g
46. a
47. i
48. n
49. s
50. t
51.
52. t
53. h
54. e
55.
56. d
57. i
58. s
59. c
60. '
61. s
62.
63. w
64. e
65. i
66. g
67. h
68. t
69. .
70.
71. R
72. e
73. b
74. o
75. u
76. n
77. d
78.
79. d
80. o
81. u
82. b
83. l
84. e
85. s
86.
87. t
88. h
89. e
90.
91. m
92. o
93. m
94. e
95. n
96. t
97. u
98. m
99.
100. t
101. r
102. a
103. n
104. s
105. f
106. e
107. r
108.
109. p
110. e
111. r
112.
113. b
114. u
115. l
116. l
117. e
118. t
119. .

Question 17: A satellite in force-free space sweeps stationary interplanetary dust at a rate \( \frac{dM}{dt}=\alpha v \), where v is the velocity. The acceleration of the satellite of mass M is
(a) \( -\frac{2\alpha v^2}{M} \)
(b) \( -\frac{3\alpha v^2}{M} \)
(c) \( -\frac{\alpha v^2}{M} \)
(d) \( -\alpha v^2 \)
Show Answer & Explanation

Answer: (c) \( -\frac{\alpha v^2}{M} \)

Explanation:
1. No external force, so momentum is conserved: \( \frac{d(Mv)}{dt}=0 \).
2. So \( M\frac{dv}{dt}+v\frac{dM}{dt}=0 \).
3. Hence \( a=-\frac{v}{M}\cdot\alpha v=-\frac{\alpha v^2}{M} \).

Teacher's Note:
1. C
2. o
3. l
4. l
5. e
6. c
7. t
8. i
9. n
10. g
11.
12. s
13. t
14. a
15. t
16. i
17. o
18. n
19. a
20. r
21. y
22.
23. d
24. u
25. s
26. t
27.
28. s
29. l
30. o
31. w
32. s
33.
34. t
35. h
36. e
37.
38. s
39. a
40. t
41. e
42. l
43. l
44. i
45. t
46. e
47. .
48.
49. A
50. p
51. p
52. l
53. y
54.
55. c
56. o
57. n
58. s
59. e
60. r
61. v
62. a
63. t
64. i
65. o
66. n
67.
68. o
69. f
70.
71. m
72. o
73. m
74. e
75. n
76. t
77. u
78. m
79.
80. t
81. o
82.
83. t
84. h
85. e
86.
87. c
88. h
89. a
90. n
91. g
92. i
93. n
94. g
95.
96. m
97. a
98. s
99. s
100. .

Question 18: If the force is F = 500 − 100t, the impulse as a function of time is
(a) \( 500t-50t^2 \)
(b) \( 50t-10 \)
(c) \( 50-t^2 \)
(d) \( 100t^2 \)
Show Answer & Explanation

Answer: (a) \( 500t-50t^2 \)

Explanation:
1. Impulse \( =\int_0^t F\,dt=\int_0^t(500-100t)\,dt \).
2. This equals \( 500t-50t^2 \).

Teacher's Note:
1. I
2. m
3. p
4. u
5. l
6. s
7. e
8.
9. i
10. s
11.
12. t
13. h
14. e
15.
16. t
17. i
18. m
19. e
20.
21. i
22. n
23. t
24. e
25. g
26. r
27. a
28. l
29.
30. o
31. f
32.
33. f
34. o
35. r
36. c
37. e
38. .
39.
40. I
41. n
42. t
43. e
44. g
45. r
46. a
47. t
48. e
49.
50. t
51. e
52. r
53. m
54.
55. b
56. y
57.
58. t
59. e
60. r
61. m
62.
63. w
64. i
65. t
66. h
67.
68. t
69. h
70. e
71.
72. l
73. i
74. m
75. i
76. t
77. s
78.
79. 0
80.
81. t
82. o
83.
84. t
85. .

Question 19: For rocket propulsion, the velocity of exhaust gases relative to the rocket is 2 km/s. If the mass of the rocket system is 1000 kg, the rate of fuel consumption for the rocket to rise up with an acceleration of 4.9 m/s² is (g = 9.8 m/s²)
(a) 12.25 kg/s
(b) 17.5 kg/s
(c) 7.35 kg/s
(d) 5.2 kg/s
Show Answer & Explanation

Answer: (c) 7.35 kg/s

Explanation:
1. Thrust \( u\left|\frac{dm}{dt}\right|=M(g+a) \).
2. Thrust = 1000 × (9.8 + 4.9) = 14700 N.
3. Rate \( =\frac{14700}{2000}=7.35\ \text{kg/s} \).

Teacher's Note:
1. T
2. h
3. r
4. u
5. s
6. t
7.
8. m
9. u
10. s
11. t
12.
13. o
14. v
15. e
16. r
17. c
18. o
19. m
20. e
21.
22. w
23. e
24. i
25. g
26. h
27. t
28.
29. a
30. n
31. d
32.
33. a
34. l
35. s
36. o
37.
38. s
39. u
40. p
41. p
42. l
43. y
44.
45. t
46. h
47. e
48.
49. a
50. c
51. c
52. e
53. l
54. e
55. r
56. a
57. t
58. i
59. o
60. n
61. .
62.
63. U
64. s
65. e
66.
67. t
68. h
69. e
70.
71. e
72. x
73. h
74. a
75. u
76. s
77. t
78.
79. s
80. p
81. e
82. e
83. d
84.
85. r
86. e
87. l
88. a
89. t
90. i
91. v
92. e
93.
94. t
95. o
96.
97. t
98. h
99. e
100.
101. r
102. o
103. c
104. k
105. e
106. t
107. .

Question 20: If the thrust on a rocket moving in force-free space with an exhaust velocity of 300 m/s is 210 N, the rate of combustion of the fuel is
(a) 0.7 kg/s
(b) 1.4 kg/s
(c) 2.7 kg/s
(d) 10.7 kg/s
Show Answer & Explanation

Answer: (a) 0.7 kg/s

Explanation:
1. Thrust \( =u\frac{dm}{dt} \).
2. Rate \( =\frac{210}{300}=0.7\ \text{kg/s} \).

Teacher's Note:
1. T
2. h
3. r
4. u
5. s
6. t
7.
8. e
9. q
10. u
11. a
12. l
13. s
14.
15. e
16. x
17. h
18. a
19. u
20. s
21. t
22.
23. s
24. p
25. e
26. e
27. d
28.
29. t
30. i
31. m
32. e
33. s
34.
35. t
36. h
37. e
38.
39. m
40. a
41. s
42. s
43.
44. e
45. j
46. e
47. c
48. t
49. e
50. d
51.
52. p
53. e
54. r
55.
56. s
57. e
58. c
59. o
60. n
61. d
62. .

Laws Of Motion Objective Questions & Solutions for JEE Physics

Chapter MCQs with Answers for JEE Physics

Review structured objective questions for JEE Physics Laws Of Motion. Built according to official JEE guidelines, these MCQ sets support daily revision and core concept reinforcement.

Expert Practice Material for JEE Physics

Cross-reference your completed choices with comprehensive NCERT solutions for JEE Physics to ensure absolute clarity across all sub-topics in this chapter.

Complete Your Chapter Revision

Explore our broader library of printable assignments, chapter notes, and mock tests designed to support continuous revision and secure higher marks in JEE assessments.

FAQs

Where can I access latest JEE Physics Laws Of Motion MCQs Set 04?

You can get most exhaustive JEE Physics Laws Of Motion MCQs Set 04 for free on StudiesToday.com. These MCQs for JEE Physics are updated for the 2026-27 academic session as per JEE examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Physics JEE material?

Yes, our JEE Physics Laws Of Motion MCQs Set 04 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the JEE paper is now competency-based.

How do practicing Physics MCQs help in scoring full marks in JEE exams?

By solving our JEE Physics Laws Of Motion MCQs Set 04, JEE students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Physics.

Do you provide answers and explanations for JEE Physics Laws Of Motion MCQs Set 04?

Yes, Physics MCQs for JEE have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused JEE exams.

Can I practice these Physics JEE MCQs online?

Yes, you can also access online interactive tests for JEE Physics Laws Of Motion MCQs Set 04 on StudiesToday.com as they provide instant answers and score to help you track your progress in Physics.