Newton's Laws of Motion — JEE Main Physics MCQs with Solutions
Free JEE Main Physics Newton's Laws of Motion MCQs with step-by-step solutions (73 questions). Part of Laws of Motion. Practise online on Prepizo — no login needed.
▶ Practise Newton's Laws of Motion online (free)
Questions with solutions
Q1 — Newton's Laws of Motion · medium · numerical
A body of mass 2 kg is acted upon by a net force of 10 N. Its acceleration is:
A. 2 m/s²
B. 5 m/s² ✓ Correct
C. 10 m/s²
D. 20 m/s²
Solution: By Newton’s second law, a = F/m = 10/2 = 5 m/s².
Q2 — Newton's Laws of Motion · medium · theory
Which of Newton’s laws explains why a passenger lurches forward when a bus stops suddenly?
A. First law (inertia) ✓ Correct
B. Second law
C. Third law
D. Law of gravitation
Solution: The passenger’s body continues moving forward due to inertia — Newton’s first law — while the bus decelerates.
Q3 — Newton's Laws of Motion · easy · theory
The hybridization of the central carbon in CH3C≡N and the bond angle CCN are
A. sp2 , 180°
B. Sp, 180° ✓ Correct
C. sp2 , 120°.
D. sp3 , 109°.
Solution: Sp, 180°
Q4 — Newton's Laws of Motion · easy · numerical
How many vovels are there?
Solution: a e i o u, they are 5
Q5 — Newton's Laws of Motion · easy · theory
Ashwin is a/an _________ reader and he can read upto _________ chapter(s) a day
Q6 — Newton's Laws of Motion · easy · theory
Is Taj Mahal Awesome?
Solution: because it is
Q7 — Newton's Laws of Motion · easy · theory
Type in Hindi | Easy Hindi Typing (हिन्दी में टाइप करें)
इंग्लिश में टाइप करे स्पेस दबाये यह हिन्दी में परिवर्तित हो जाएगा
Many educationalists consider it a weak and woolly field, too far removed from the practical applications of the real world to be useful. But philosophers dating back to Plato and the Ancient Greeks have given the area much thought and emphasis, and there is little doubt that their work has helped shape the practice of education over the millennia.
Q8 — Newton's Laws of Motion · medium · numerical
A gun of mass $2$ kg fires a bullet of mass $0.02$ kg at $100$ m/s. The recoil velocity of the gun is
A. $1$ m/s ✓ Correct
B. $2$ m/s
C. $100$ m/s
D. $0.01$ m/s
Solution: Momentum conservation: $M V = m v \Rightarrow V = \frac{0.02 \times 100}{2} = 1$ m/s.
Q9 — Newton's Laws of Motion · medium · numerical
A man pushes a wall with a force of $50$ N. The force exerted by the wall on the man is
A. $100$ N
B. $50$ N ✓ Correct
C. Zero
D. $25$ N
Solution: By Newton's third law, the reaction force is equal and opposite: $50$ N.
Q10 — Newton's Laws of Motion · medium · numerical
A $60$ kg man jumps out of a $40$ kg boat at $2$ m/s. The boat's recoil speed is
A. $3$ m/s ✓ Correct
B. $1.33$ m/s
C. $2$ m/s
D. $5$ m/s
Solution: $60 \times 2 = 40 \times V \Rightarrow V = 3$ m/s.
Q11 — Newton's Laws of Motion · medium · numerical
Blocks of $2$ kg and $3$ kg are in contact on a smooth floor, pushed by $10$ N applied to the $2$ kg block. The contact force between them is
A. $10$ N
B. $4$ N
C. $5$ N
D. $6$ N ✓ Correct
Solution: $a = \frac{10}{5} = 2$ m/s²; contact force accelerates the $3$ kg block: $3 \times 2 = 6$ N.
Q12 — Newton's Laws of Motion · medium · numerical
A bullet of $0.01$ kg leaves a $5$ kg gun at $200$ m/s. The gun's recoil velocity is
A. $200$ m/s
B. $4$ m/s
C. $0.4$ m/s ✓ Correct
D. $0.04$ m/s
Solution: $V = \frac{0.01 \times 200}{5} = 0.4$ m/s.
Q13 — Newton's Laws of Motion · easy · numerical
A $40$ kg boy steps off a $20$ kg trolley (on smooth ground) at $1$ m/s. The trolley's speed is
A. $0.5$ m/s
B. $2$ m/s ✓ Correct
C. $1$ m/s
D. $4$ m/s
Solution: $40 \times 1 = 20 \times V \Rightarrow V = 2$ m/s.
Q14 — Newton's Laws of Motion · easy · numerical
Two skaters push apart. A $50$ kg skater moves at $2$ m/s; a $40$ kg skater moves at
A. $5$ m/s
B. $1.6$ m/s
C. $2.5$ m/s ✓ Correct
D. $2$ m/s
Solution: $50 \times 2 = 40 \times V \Rightarrow V = 2.5$ m/s.
Q15 — Newton's Laws of Motion · medium · theory
A ball strikes a wall with a force of $20$ N. The force exerted by the wall on the ball is
A. $10$ N
B. Zero
C. $40$ N
D. $20$ N (opposite direction) ✓ Correct
Solution: Third law: equal and opposite reaction of $20$ N.
Q16 — Newton's Laws of Motion · medium · numerical
On a smooth floor, blocks of $4$ kg and $6$ kg are in contact; $20$ N is applied to the $4$ kg block. The contact force is
A. $20$ N
B. $12$ N ✓ Correct
C. $6$ N
D. $8$ N
Solution: $a = \frac{20}{10} = 2$ m/s²; contact force on $6$ kg $= 6 \times 2 = 12$ N.
Q17 — Newton's Laws of Motion · medium · numerical
A gun of mass $4$ kg fires a $0.05$ kg bullet at $80$ m/s. The recoil velocity of the gun is
A. $0.05$ m/s
B. $1$ m/s ✓ Correct
C. $80$ m/s
D. $4$ m/s
Solution: $V = \frac{0.05 \times 80}{4} = 1$ m/s.
Q18 — Newton's Laws of Motion · easy · numerical
A $50$ kg man walks at $2$ m/s on a $100$ kg boat (smooth water). The boat moves at
A. $0.5$ m/s
B. $2$ m/s
C. $4$ m/s
D. $1$ m/s ✓ Correct
Solution: $50 \times 2 = 100 \times V \Rightarrow V = 1$ m/s.
Q19 — Newton's Laws of Motion · medium · numerical
A rope has a tension of $30$ N pulling block A. The force block A exerts back on the rope is
A. $60$ N
B. Zero
C. $30$ N ✓ Correct
D. $15$ N
Solution: Action-reaction: block A pulls the rope with $30$ N.
Q20 — Newton's Laws of Motion · medium · numerical
A cannon of mass $500$ kg fires a $5$ kg ball at $200$ m/s. The recoil speed of the cannon is
A. $0.2$ m/s
B. $2$ m/s ✓ Correct
C. $20$ m/s
D. $200$ m/s
Solution: $V = \frac{5 \times 200}{500} = 2$ m/s.
Q21 — Newton's Laws of Motion · easy · numerical
A swimmer pushes water backward with $60$ N. The force propelling the swimmer forward is
A. $30$ N
B. $60$ N ✓ Correct
C. Zero
D. $120$ N
Solution: Third law: the water pushes the swimmer forward with $60$ N.
Q22 — Newton's Laws of Motion · medium · numerical
Blocks of $1$ kg and $2$ kg touch on a smooth floor; $6$ N is applied to the $1$ kg block. The contact force is
A. $4$ N ✓ Correct
B. $3$ N
C. $6$ N
D. $2$ N
Solution: $a = \frac{6}{3} = 2$ m/s²; force on $2$ kg block $= 2 \times 2 = 4$ N.
Q23 — Newton's Laws of Motion · easy · numerical
Two people of $60$ kg and $90$ kg push apart on ice. The $60$ kg person moves at $3$ m/s; the $90$ kg person moves at
A. $3$ m/s
B. $1$ m/s
C. $4.5$ m/s
D. $2$ m/s ✓ Correct
Solution: $60 \times 3 = 90 \times V \Rightarrow V = 2$ m/s.
Q24 — Newton's Laws of Motion · medium · numerical
A bullet of $0.04$ kg is fired at $50$ m/s. The magnitude of the gun's recoil momentum is
A. $1.25$ kg·m/s
B. $2$ kg·m/s ✓ Correct
C. $0.8$ kg·m/s
D. $50$ kg·m/s
Solution: Recoil momentum equals bullet momentum: $0.04 \times 50 = 2$ kg·m/s.
Q25 — Newton's Laws of Motion · medium · numerical
Blocks of $3$ kg and $2$ kg touch on a smooth floor; $15$ N pushes the $3$ kg block. The contact force is
A. $15$ N
B. $6$ N ✓ Correct
C. $9$ N
D. $5$ N
Solution: $a = \frac{15}{5} = 3$ m/s²; force on $2$ kg $= 2 \times 3 = 6$ N.
Q26 — Newton's Laws of Motion · medium · numerical
A gun of $10$ kg recoils at $0.5$ m/s after firing a $0.05$ kg bullet. The bullet's speed is
A. $100$ m/s ✓ Correct
B. $10$ m/s
C. $50$ m/s
D. $200$ m/s
Solution: $0.05 v = 10 \times 0.5 \Rightarrow v = 100$ m/s.
Q27 — Newton's Laws of Motion · medium · numerical
A rocket ejects gas at the rate of $2$ kg/s with a speed of $500$ m/s. The thrust on the rocket is
A. $1000$ N ✓ Correct
B. $502$ N
C. $2000$ N
D. $250$ N
Solution: Thrust $= v \frac{dm}{dt} = 500 \times 2 = 1000$ N.
Q28 — Newton's Laws of Motion · medium · numerical
A gun of $6$ kg fires a $0.02$ kg bullet at $300$ m/s. The recoil speed of the gun is
A. $1$ m/s ✓ Correct
B. $6$ m/s
C. $0.1$ m/s
D. $300$ m/s
Solution: $V = \frac{0.02 \times 300}{6} = 1$ m/s.
Q29 — Newton's Laws of Motion · medium · numerical
On a smooth floor, $20$ N pushes a $6$ kg block that is in contact with a $4$ kg block. The contact force on the $4$ kg block is
A. $8$ N ✓ Correct
B. $12$ N
C. $20$ N
D. $4$ N
Solution: $a = \frac{20}{10} = 2$ m/s²; force on $4$ kg $= 4 \times 2 = 8$ N.
Q30 — Newton's Laws of Motion · easy · numerical
Two carts push apart. A $20$ kg cart moves at $4$ m/s; a $40$ kg cart moves at
A. $2$ m/s ✓ Correct
B. $4$ m/s
C. $8$ m/s
D. $1$ m/s
Solution: $20 \times 4 = 40 \times V \Rightarrow V = 2$ m/s.