Physics - MOST IMPORTANT CAPF Previous Year Questions

Trough and ridge are

Which one of the following is not the unit of pressure?

A canon shoots a ball upwards with an initial speed of 100 m/s. The total time of flight of the ball is 20 s before it hits the ground. The ball looses 70% of its speed after hitting the ground. Which among the following is the correct height that the ball will bounce up after its first bounce ? (g = 10 m/s^2)

Which one of the following conservation laws is a consequence of the Newton's third law of motion ?

A simple harmonic motion of a particle is represented as, y = 10 cos wt. The acceleration of the particle at time t = π/2w will be : (symbols here carry their usual meanings)

Which one of the following statements regarding motion is correct ?

Which one of the following statements with regard to Newton's third law of motion is NOT correct ?

The explanation of, why we get thrown back with a jerk when the stationary bus we are sitting in starts moving forward is given by :

Which one of the following is the audible range of hearing for humans ?

A sound wave of frequency of 2 kHz has a wavelength of 35 cm in a given medium. How long will it take to travel a distance of 2.1 km through the medium ?

The time elapsed between viewing a lightning flash and hearing the thunder of a cloud is 10 s. If the speeds of sound and light in air are 330 m/s and 3x10^8 m/s respectively, how far away is the storm?

Which one of the following phenomena CANNOT be exhibited by sound waves ?

When a longitudinal wave moves through a certain medium, the quantity which is transmitted through the medium is

Statement I: Sound waves can travel through vacuum. Statement II: Light is an electromagnetic wave and can travel through vacuum.

The Stethoscope used by a medical practitioner is based on the phenomenon of :

Match List-I with List-II and select the correct answer using the code given below the lists : List-I (Phenomenon): A. Reverberation, B. Resonance, C. Refraction of light. List-II (Reason): 1. Occurs when two waves of equal frequency superpose, 2. Occurs when two waves have slightly different frequencies superpose, 3. Prolonged echo, 4. Occurs as a ray of light enters a second medium.

A wire of resistance R is cut into four equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R', then the ratio R'/R is :

The electrical device used for converting mechanical energy into electrical energy is called

At the time of short circuit, the current in an electric circuit

Let an electric current of 1.5 A flow through an incandescent lamp in a circuit. What is the amount of charge that flows through it in 10 ms?