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Laws of Motion — JEE Main Physics MCQs with Solutions
Free JEE Main Physics Laws of Motion MCQs with step-by-step solutions covering Newton's Laws, Friction, Introduction to Force, Inertia, Newtons 3 Laws. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — Newton's Laws · 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°
Q2 — Newton's Laws · easy · numerical
How many vovels are there?
Solution: a e i o u, they are 5
Q3 — Newton's Laws · easy · theory
Ashwin is a/an _________ reader and he can read upto _________ chapter(s) a day
Q4 — Newton's Laws · easy · theory
Is Taj Mahal Awesome?
Solution: because it is
Q5 — Newton's Laws · easy · theory
Is Taj Mahal Awesome?
Solution: because it’s not
Q6 — Newton's Laws · 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.
Q7 — Newton's Laws · 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: any explanation for the same
Q8 — Newton's Laws · easy · theory
Ashwin is a/an _________ reader and he can read upto _________ chapter(s) a day
Q9 — Introduction to Force · easy · numerical
A body accelerates at $3$ m/s² under a force of $12$ N. Its mass is
A. $9$ kg
B. $4$ kg ✓ Correct
C. $36$ kg
D. $0.25$ kg
Solution: $m = F/a = 12/3 = 4$ kg.
Q10 — Introduction to Force · easy · numerical
The weight of a body of mass $10$ kg (g = 10 m/s²) is
A. $10$ N
B. $1$ N
C. $100$ N ✓ Correct
D. $1000$ N
Solution: $W = mg = 10 \times 10 = 100$ N.
Q11 — Introduction to Force · easy · numerical
A body has a weight of $50$ N. Its mass (g = 10 m/s²) is
A. $50$ kg
B. $500$ kg
C. $0.5$ kg
D. $5$ kg ✓ Correct
Solution: $m = W/g = 50/10 = 5$ kg.
Q12 — Introduction to Force · easy · numerical
Two collinear forces $5$ N and $3$ N act in the SAME direction. The net force is
A. $8$ N ✓ Correct
B. $4$ N
C. $15$ N
D. $2$ N
Solution: Same direction, so they add: $5 + 3 = 8$ N.
Q13 — Introduction to Force · easy · numerical
Two collinear forces $10$ N and $4$ N act in OPPOSITE directions. The net force is
A. $6$ N ✓ Correct
B. $2.5$ N
C. $40$ N
D. $14$ N
Solution: Opposite directions subtract: $10 - 4 = 6$ N.
Q14 — Introduction to Force · easy · numerical
The force needed to accelerate a $1000$ kg car at $2$ m/s² is
A. $1002$ N
B. $500$ N
C. $2$ N
D. $2000$ N ✓ Correct
Solution: $F = ma = 1000 \times 2 = 2000$ N.
Q15 — Introduction to Force · easy · numerical
The weight of a $10$ kg object on the Moon (g = 1.6 m/s²) is
A. $16$ N ✓ Correct
B. $100$ N
C. $6.25$ N
D. $1.6$ N
Solution: $W = mg = 10 \times 1.6 = 16$ N.
Q16 — Introduction to Force · easy · numerical
A spring of stiffness $200$ N/m is stretched by $0.1$ m. The force in the spring is
A. $200.1$ N
B. $20$ N ✓ Correct
C. $0.5$ N
D. $2000$ N
Solution: $F = kx = 200 \times 0.1 = 20$ N.
Q17 — Introduction to Force · easy · numerical
A force of $5$ kgf (g = 10 m/s²) expressed in newtons is
A. $0.5$ N
B. $5$ N
C. $500$ N
D. $50$ N ✓ Correct
Solution: $1$ kgf $= g$ N $= 10$ N, so $5$ kgf $= 50$ N.
Q18 — Introduction to Force · easy · theory
On a body, $10$ N acts right, and $3$ N and $2$ N act left. The net force is
A. $5$ N to the left
B. $5$ N to the right ✓ Correct
C. $9$ N
D. $15$ N
Solution: Net $= 10 - (3 + 2) = 5$ N to the right.
Q19 — Introduction to Force · easy · numerical
An $8$ kg body under a net force of $40$ N accelerates at
A. $320$ m/s²
B. $0.2$ m/s²
C. $5$ m/s² ✓ Correct
D. $48$ m/s²
Solution: $a = 40/8 = 5$ m/s².
Q20 — Introduction to Force · easy · numerical
A vertical string holds a $3$ kg mass in equilibrium. The tension (g = 10 m/s²) is
A. $3$ N
B. $300$ N
C. Zero
D. $30$ N ✓ Correct
Solution: Tension balances weight: $T = mg = 30$ N.
Q21 — Introduction to Force · easy · numerical
A body of mass $5$ kg has weight (g = 9.8 m/s²) approximately
A. $14.8$ N
B. $49$ N ✓ Correct
C. $0.5$ N
D. $5$ N
Solution: $W = 5 \times 9.8 = 49$ N.
Q22 — Introduction to Force · easy · numerical
A body weighs $200$ N. Its mass (g = 10 m/s²) is
A. $2$ kg
B. $2000$ kg
C. $20$ kg ✓ Correct
D. $200$ kg
Solution: $m = 200/10 = 20$ kg.
Q23 — Introduction to Force · easy · numerical
Two forces of $8$ N and $6$ N act at $90°$. The resultant makes with the $8$ N force an angle $\theta$ where $\tan\theta =$
A. $0.75$ ✓ Correct
B. $1.33$
C. $1$
D. $0.5$
Solution: $\tan\theta = \frac{6}{8} = 0.75$ (resultant is $10$ N).
Q24 — Introduction to Force · easy · numerical
A $50$ kg person stands in a stationary lift. The normal force on the person (g = 10 m/s²) is
A. $5000$ N
B. Zero
C. $50$ N
D. $500$ N ✓ Correct
Solution: Lift stationary: $N = mg = 50 \times 10 = 500$ N.
Q25 — Inertia · easy · numerical
Momentum, the measure of inertia of motion, of a $2$ kg body moving at $5$ m/s is
A. $7$ kg·m/s
B. $0.4$ kg·m/s
C. $2.5$ kg·m/s
D. $10$ kg·m/s ✓ Correct
Solution: $p = mv = 2 \times 5 = 10$ kg·m/s.
Q26 — Inertia · easy · numerical
The momentum of a $0.5$ kg ball moving at $20$ m/s is
A. $0.025$ kg·m/s
B. $40$ kg·m/s
C. $20.5$ kg·m/s
D. $10$ kg·m/s ✓ Correct
Solution: $p = 0.5 \times 20 = 10$ kg·m/s.
Q27 — Inertia · easy · theory
Which body has GREATER inertia: a $2$ kg or a $5$ kg body?
A. Both equal
B. The $2$ kg body
C. Cannot say
D. The $5$ kg body ✓ Correct
Solution: Inertia is measured by mass; the $5$ kg body has more mass, hence more inertia.
Q28 — Inertia · easy · numerical
A body has momentum $30$ kg·m/s and mass $3$ kg. Its velocity is
A. $10$ m/s ✓ Correct
B. $27$ m/s
C. $90$ m/s
D. $0.1$ m/s
Solution: $v = p/m = 30/3 = 10$ m/s.
Q29 — Inertia · easy · numerical
A body has momentum $40$ kg·m/s at a velocity of $8$ m/s. Its mass is
A. $0.2$ kg
B. $48$ kg
C. $320$ kg
D. $5$ kg ✓ Correct
Solution: $m = p/v = 40/8 = 5$ kg.
Q30 — Inertia · easy · numerical
A body moves at a constant velocity of $10$ m/s with no external force. By the law of inertia, its velocity after $5$ s is
A. $2$ m/s
B. $10$ m/s ✓ Correct
C. Zero
D. $50$ m/s
Solution: With no net force, Newton's first law keeps the velocity unchanged at $10$ m/s.