physics

Which of the following statements about solid friction are correct? It..

i. is a force ii. occurs between the surfaces of two bodies in contact iii. depends on the area in…

6 years ago

Which of the following physical quantities is correctly paired with it’s corresponding S.I unit?

A. density[kg/m³] B. power[Js‾¹] C. specific latent heat [J kg‾¹K‾¹ D. Pressure [Nm‾¹] Correct Answer: Option B B. power[Js‾¹]

6 years ago

Which of the following observations is not an effect of surface tension?

A. droplets of water dripping slowly from a tap B. mercury spilled on a clean glass plate forms spherical droplets…

6 years ago

The diagram below shows three forces F1, F2 and F3, which of the following equations is correct?

A. F3 = F1 + F2 B. F2 = F1 + F3 C. F1 = F2 - F3 D. F1…

6 years ago

A radioactive element has a decay constant of 0.077s‾¹. Calculate its half-life.

A. 13.0s B. 9.0s C. 5.1s D. 0.5s Correct Answer: Option B B. 9.0s Explanation t½ = 0.693/λ = 0.693/0.077…

6 years ago

Control in nuclear reactors is effected with boron rods because the rods have the ability to?

A. absorb electrons B. absorb neutron C. accelerate electrons D. slow down neutrons Correct Answer: Option B B. absorb neutron

6 years ago

Nuclear fission is preferred to nuclear fusion in the generation of energy because?

A. very high temperature is required for fusion B. the raw materials for fusion are easily obtained C. Energy obtained…

6 years ago

When a radioactive substance undergoes a beta decay, its?

A. mass number decreases by 1 B. atomic number decreases by 1 C. mass number increases by 1 D. atomic…

6 years ago

Both γ-rays and X-rays ________. Which of the statements above is/are correct?

  i. can be produced by thermionic emission ii. have low frequencies iii. have short wavelengths. A. i only B.…

6 years ago

A direct current of 5A flow through a 0.2H inductor. Calculate the energy stored in the inductor?

A. 0.5J B. 1.0J C. 2.5J D. 5.0J Correct Answer: Option D D. 5.0J Explanation P = I²L=5²×0.2 = 5J

6 years ago