physics

Which of the following statements is correct about cathode rays? They are fast-moving

A. atoms B. ions C. neutrons D. protons E. electrons Correct Answer: Option E - electrons

5 years ago

What is the electric potential at a point distance r from a proton of charge q placed in a medium of permittivity εo?

A. q2/4πεor² B. q/4πεor² C. q²/4πεor D. qr/4πεo E. 4πεoq²r Correct Answer: Option B - q/4πεor²

5 years ago

Calculate the energy stored in 20μF capacitor if the potential difference between the plates is 40V.

A. 3.2 x10−²J B. 1.6x10²J C. 8.0x10^-4J D. 4.0x10^-4J E. 2.0x10^-4J Correct Answer: Option B - 1.6x10²J Explanation E =…

5 years ago

Which of the following statements is not correct about magnet?

A. A magnetic Held is a region where a magnetic force can be detected. B. Magnetic fields are scalar quantities.…

5 years ago

In a domestic circuit, electrical appliances and lamps are arranged in parallel across the mains so as to enable the?

A. same current to flow through the electrical appliances and the lamps B. maximum energy to be consumed at least…

5 years ago

Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?

A. Polarization B. Local action C. Formation of hydrogen electrode D. Increase in the resistance of the cell E. Generation…

5 years ago

Which of the following statements is not true sound?

A. Musical notes consist of the combination of sounds of regular frequency B. The combination of overtones produced by an…

5 years ago

Which of the following waves are longitudinal waves?

l. Ripples on the surface of water II. Waves produced by a tuning fork vibrating in air III. Light waves…

5 years ago

How far from a cliff should a boy stand in order to hear the echo of his clap 0.9s later? (Speed of sound in air = 330 m/s)

A. 36.67m B. 74.25m C. 148.50m D. 297.00 E. 366.67m Correct Answer: Option C - 148.50m Explanation v = 2x/t…

5 years ago