Category: Physics

The electric force between two point charges each of the magnitude, q at a distance of r apart in the air of permittivity is: A. q2/4πεr B. rε0/q2 C. 4πq/ε0 D. qr2/ε0 E. qε0/4πε0r2 Correct Answer: Option E E. qε0/4πε0r2...

Calculate the escape velocity for a rocket fired from the earth’s surface at a point where the acceleration due to gravity is 10ms-2 and the radius of the earth is 6 x 106m. A. 7.8 x 106ms-1 B. 1.1 x 104ms-1 C. 3.5 x...

What is the gravitational potential due to a molecule of mass, m and at a distance, r from it? (G = gravitational constant). A. Gm2/r2 B. Gm/r C. Gm2/r D. G2m2/r E. m2/Gr2 Correct Answer: Option B B....

Which of the following is not a property of longitudinal waves? A. compression B. reflection C. refraction D. polarization E. diffraction Correct Answer: Option D D....

A string is stretched between two points 50cm apart. It is then plucked at its center and the velocity of the wave produced is 300m/s. Calculate the number of vibrations made by the string in 1s. A. 3 B. 6 C. 150 D. 300 E. 600...

In a wave, the maximum displacement of particles from their equilibrium positions is called? A. frequency B. amplitude C. period D. wavelength E. wave velocity Correct Answer: Option B B....

A sound pulse sent vertically downwards into the earth is reflected from two different layers of the earth such that echoes are heard 1.2s and 1.4s. Assuming speed of the pulse is 2000ms-1, calculate the distance between the...

Which of the following is a stringed instrument? A. flute B. trumpet C. piano D. drum E. saxophone Correct Answer: Option C C. piano

The distance between a node and an anti-node for a transverse wave is equal to A. the wavelength B. thrice the wavelength C. one-half of the wavelength D. one-quarter of the wavelength E. three-quarters of the wavelength Correct...

The refractive index of a given transparent medium is 1.4. Which of the following is the minimum internal angle for total internal reflection to take place in the medium? A. 30 degree B. 36 degree C. 44 degree D. 46 degree E....

The image in a pin-hole camera is always A. diminished B. enlarged C. upright D. inverted E. blurred Correct Answer: Option D D. inverted

A ray of light is incidence on a plane mirror at an angle of 35o. What is the angle by the reflected ray with the surface of the mirror? A. 125o B. 70o C. 65o D. 55o E. 35o Correct Answer: Option D D. 55o Explanation The angle...