# NCERT Exemplar Class 11 Physics Chapter 3 Motion in a Plane

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(b)

(a) 60 m
(b) 71 m
(c) 100 m
(d) 141 m

(c) 100 m

## Q.3. The component of a vector r along X-axis will have maximum value if

(a) r is along positive Y-axis
(b) r is along positive X-axis
(c) r makes an angle of 45° with the X-axis
(d) r is along negative Y-axis

(b) r is along positive X-axis

## Q.4. In a two-dimensional motion, instantaneous speed v0 is a positive constant. Then, which of the following are necessarily true?

(a) The acceleration of the particle is zero.
(b) The acceleration of the particle is bounded.
(c) The acceleration of the particle is necessarily in the plane of motion.
(d) The particle must be undergoing a uniform circular motion.

(c) The acceleration of the particle is necessarily in the plane of motion.

## Q.5. A particle slides down a frictionless parabolic (y = x2) track (A – B – C) starting from rest at point A (figure). Point B is at the vertex of parabola and point C is at a height less than that of point A. After C, the particle moves freely in air as a projectile. If the particle reaches highest point at P, then

(a) KE at P = KE at B
(b) height at P = height at A
(c) total energy at P = total energy at A
(d) time of travel from A to B

(c) total energy at P = total energy at A

## Q.6. Which one of the following statements is true?

(a) A scalar quantity is the one that is conserved in a process.
(b) A scalar quantity is the one that can never take negative values.
(c) A scalar quantity is the one that does not vary from one point to another in space.
(d) A scalar quantity has the same value for observers with different orientation of the axes.

(d) A scalar quantity has the same value for observers with different orientation of the axes.

## Q.7. For a particle performing uniform circular motion, choose the correct

statement(s) from the following.

(a) Magnitude of particle velocity (speed) remains constant.
(b) Particle velocity remains directed perpendicular to radius vector.
(c) Direction of acceleration keeps changing as particle moves.
(d) Angular momentum is constant in magnitude but direction keeps changing.

(a) (b) (c)

## Q.8. Consider the quantities pressure, power, energy, impulse, gravitational potential, electrical charge, temperature, area. Out of these, the only vector quantities are

(a) Impulse, pressure and area
(b) Impulse and area
(c) Area and gravitational potential
(d) Impulse and pressure

(b) Impulse and area

(c)

(b)

## Q.11. Figure shows the orientation of two vectors u and v in the TY-plane.

which of the following is correct?
(a) a and p are positive while b and q are negative
(b) a, p and b are positive while q is negative
(c) a, q and b are positive while p is negative
(d) a, b, p and q are all positive

(b) a, p and b are positive while q is negative

### NCERT Exemplar Class 11 Physics Solutions

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