Practice <strong>NEET UG Physics</strong> MCQ questions covering Mechanics, Thermodynamics, Waves & Optics, Modern Physics, Electricity & Magnetism, and Electromagnetic Induction. Aligned with NCERT Class 11 & 12 Physics syllabus.
A body is moving with a constant velocity of 10 m/s. What is the net force acting on it?
Answer: A
According to Newton's first law, when velocity is constant, acceleration is zero. Therefore, net force F = ma = m × 0 = 0 N.
Q.2Easy
If the mass of an object is doubled and the force applied remains the same, how does the acceleration change?
Answer: B
From Newton's second law, F = ma. If F is constant and m doubles, then a = F/2m, so acceleration becomes half.
Q.3Easy
A 5 kg object experiences a net force of 20 N. What is its acceleration?
Answer: B
Using F = ma, we get a = F/m = 520 = 4 m/s².
Q.4Easy
Which of the following is NOT a consequence of Newton's third law of motion?
Answer: B
Newton's third law states action and reaction act on different bodies, not the same body. They are equal in magnitude, opposite in direction, and act simultaneously.
Q.5Easy
Three forces of 10 N, 20 N, and 30 N act on a body in the same direction. What is the resultant force?
Answer: D
When forces act in the same direction, the resultant is the sum of all forces: 10 + 20 + 30 = 60 N.
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Q.6Easy
A book rests on a table. The normal force exerted by the table on the book is an example of:
Answer: C
Normal force is a contact force arising from physical contact between the table and book. The action-reaction pair would be the weight of the book and the force the book exerts on the table.
Q.7Easy
A stone is thrown vertically upward from the ground. At the highest point, the velocity is zero but acceleration is not. What is the acceleration at the highest point?
Answer: B
At the highest point, velocity is zero, but the gravitational force continues to act, producing an acceleration of g = 10 m/s² downward.
Q.8Easy
A car moving at 72 km/h brakes with a deceleration of 5 m/s². How long does it take to stop?
Answer: B
72 km/h = 20 m/s. Using v = u - at, 0 = 20 - 5t, so t = 4 seconds.
Q.9Easy
A ball is dropped from a height of 80 m. If air resistance is negligible, what is the velocity of the ball just before it hits the ground? (g = 10 m/s²)
Answer: B
Using v² = u² + 2as, where u = 0, a = 10 m/s², s = 80 m. v² = 0 + 2(10)(80) = 1600, so v = 40 m/s
Q.10Easy
Which of the following is NOT a consequence of Newton's first law of motion?
Answer: C
Option C is the statement of Newton's second law (F = ma), not the first law. Newton's first law deals with inertia and absence of acceleration.
Q.11Easy
A vehicle increases its speed from 18 km/h to 54 km/h in 8 seconds. What is the acceleration of the vehicle?
Answer: A
Initial velocity u = 18 km/h = 5 m/s. Final velocity v = 54 km/h = 15 m/s. Time t = 8 s. Using a = (v - u)/t = (15 - 5)/8 = 810 = 1.25 m/s²
Q.12Easy
A particle moves along a circular path of radius 5 m with a constant speed of 20 m/s. What is the centripetal acceleration?
