Question 1

Which of the following physical quantities can be represented by the slope of a position-time graph?

Accepted Answer

The slope of a position-time (x-t) graph at any point represents the rate of change of position with respect to time, which is defined as velocity. Therefore, the correct option is velocity.

Question 2

The area under the velocity-time graph represents which of the following quantities?

Accepted Answer

The area under the velocity-time graph represents the product of velocity and time, which corresponds to displacement. Therefore, the correct option is displacement.

Question 3

What does the slope of a velocity-time graph represent?

Accepted Answer

The slope of a velocity-time graph is the rate of change of velocity with respect to time, which is defined as acceleration. Therefore, the correct option is acceleration.

Question 4

If the position of an object is given by x = a + bt^2, where a and b are constants, then its instantaneous acceleration at time t is:

Accepted Answer

Velocity v = dx/dt = 2bt. Acceleration a = dv/dt = 2b. Thus, the acceleration is constant and equal to 2b. Therefore, the correct option is 2b.

Question 5

Which of the following can be zero even when a particle has a non-zero average speed for a given time interval?

Accepted Answer

Average velocity depends on total displacement. If a particle returns to its starting point, displacement is zero, hence average velocity is zero, while average speed is non-zero.

Motion in a Straight Line — NCERT Class 11 Physics Important Questions & Revision Notes