NEET Physics Motion in a Plane MCQs Set A

Question. The component of a vector r along X-axis will have maximum value if
(a) r is along positive X-axis
(b) r is along positive Y-axis
(c) makes an angle of 45° with the X-axis
(d) r is along negative Y-axis

Answer: A

Question. The horizontal range of a projectile fired at an angle of 15° is 50 m. If it is fired with the same speed at an angle of 45°, its range will be
(a) 100 m
(b) 141 m
(c) 71 m
(d) 60 m

Answer: A

Question. Consider the quantities, pressure, power, energy, impulse, gravitational potential, electrical charge, temperature, area. Out of these, the only vector quantities are
(a) impulse and area
(b) impulse, pressure and area
(c) area and gravitational potential
(d) impulse and pressure

Answer: A

Question.  In a two dimensional motion, instantaneous speed v₀ is a positive constant. Then, which of the following are necessarily true?
(a) Equal path lengths are traversed in equal intervals
(b) Displacements in equal time intervals are equal
(c) Average acceleration must always vanish
(d) The average velocity is not zero at any time

Answer: A

Question.  Two projectiles are fired from the same point with the same speed at angles of projection 60º and 30º respectively. Which one of the following is true?
(a) Their range will be same
(b) Their landing velocity will be same
(c) Their time of flight will be same
(d) Their maximum height will be same

Answer: A

Question. Assertion : The magnitude of velocity of two boats relative to river is same. Both boats start simultaneously from same point on one bank may reach opposite bank simultaneously moving along different paths.
Reason : For boats to cross the river in same time. The component of their velocity relative to river in direction normal to flow should be same.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question.  If the magnitude of sum of two vectors is equal to the magnitude of difference of the two vectors, the angle between these vectors is
(a) 90°
(b) 45°
(c) 180°
(d) 0°

Answer: A

Question.  The x and y coordinates of the particle at any time are x = 5t – 2t² and y = 10t respectively, where x and y are in meters and t in seconds. The acceleration of the particle at t = 2s is
(a) –4 m/s²
(b) –8 m/s²
(c) 0
(d) 5 m/s²

Answer: A

Question. Assertion : The trajectory of projectile is quadratic in y and linear in x.
Reason : y component of trajectory is independent of xcomponent.
(a) Assertion is incorrect, reason is correct
(b) Assertion is correct, reason is incorrect
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Answer: A

Question.  A hunter aims his gun and fires a bullet directly at a monkey on a tree. At the instant the bullet leaves the barrel of the gun, the monkey drops. Pick the correct statement regarding the situation.
(a) The bullet will always hit the monkey
(b) The bullet may or may not hit the monkey
(c) Can’t be predicted
(d) The bullet will never hit the monkey

Answer: A

Question.  When a shot is projected from a gun at any angle of elevation, the shot as seen from the point of projection will appear to descend past a vertical target with
(a) uniform velocity
(b) non-uniform velocity
(c) uniform acceleration
(d) None of these

Answer: A

Question.  Consider the quantities, pressure, power, energy, impulse, gravitational potential, electrical charge, temperature, area. Out of these, the only vector quantities are
(a) None of these
(b) area and gravitational potential
(c) impulse and pressure
(d) impulse, pressure and area

Answer: A