physics

Calculate the resistance of the filament of a lamp rates 240V; 40W?

A. 240Ω B. 360Ω C. 720Ω D. 1440Ω E. 2880Ω Correct Answer: Option D - 1440Ω Explanation R = V²/P…

5 years ago

What is the electric potential energy between two protons each of charge q and at a distance of r apart? (Permittivity of free space = εo)

A. 4πεoq²r B. qr/4πεo C. q/4πεor D. q²/4πεor E. q²/4πεor Correct Answer: Option C - q/4πεor

5 years ago

Which of the following pairs of light rays shows the widest separation in the spectrum of white light?

A. Yellow and red B. Orange and green C. Violet and blue D. Blue and green E. Red and indigo…

5 years ago

A concave mirror of radius of curvature 20cm has a pin placed at 15cm from its pole. What will be the magnification of the image formed?

A. 4.00 B. 2.00 C. 1.33 D. 1.50 E. 0.25 Correct Answer: Option B - 2.00 Explanation 1/U + 1/V…

5 years ago

A stone is dropped into the middle of a pool of water. Which of the following statements is/are correct?

I. Spherical waves are set up in the water. II. The water moves outwards to the sides of the pool.…

5 years ago

Which of the following is/are necessary for the production of interference with two wave trains?

I. The sources must be close to each other. II The waves must have the same frequency. III. The waves…

5 years ago

Which of the following is/are characteristics of sound?

I. Pitch II. Loudness III. Quality IV Noise A. I only B. II only C. I and II only D.…

5 years ago