Physics Questions & Answers - Free Online Practice

1,521.

The velocity ratio of an inclined plane

increases with increase in the angle of inclination

increases with decrease in the angle of inclination

decreases with decrease in the angle of inclination

is independent of the angle of inclination

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,522.

A body of mass 11kg is suspended from a ceiling fan by an aluminum wire of length 2m and diameter 2mm. Calculate the elastic energy stored in the wire [Young's modulus of aluminum is 7.0 x 10¹⁰Nm^-2, g = 10ms^-2, $\pi$ = 3.142]`

1.1 x 10^-1J

5.5 x 10^-2J

1.1 x 10^-4J

5.5 x 10^-8J

View answer & explanation

Correct answer is B

e = $\frac{4FI}{Y \pi d^2} = \frac{4 \times 11 \times 10 \times 2}{7 \times 10^3 \times 3.14(2 \times 10^{-2})^2}$

= 0.001m

E = $\frac{1}{2} Fe = \frac{1}{2} \times 110 \times 0.001$

= 5.5 x 10^-2J

1,523.

From Newton's first law of motion,

a body can only undergo translational motion

once a body remains at rest no force acts on it

the net force acting in uniform linear motion is zero

a body's inertia is its weight

View answer & explanation

Correct answer is C

The key point of this law is that if there is no net force resulting from unbalanced forces acting on an object. If all the external forces cancel each other out, then the object will maintain a constant velocity.

1,524.

The maximum displacement on either side of the equilibrium position of an object in simple harmonic motion represents

period

amplitude

wavelength

frequency

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,525.

A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms^-2]. Determine the potential energy of the body at the maximum height of its motion

0.36J