physics

Which of the following is not a part of the electromagnetic spectrum?

A. x-rays B. microwaves C. infrared radiation D. alpha rays Correct Answer: Option D D. alpha rays

6 years ago

Which of the following characteristics of light determines its colour?

A. velocity B. wavelength C. amplitude D. intensity Correct Answer: Option B B. wavelength

6 years ago

A thin lens is placed 50cm from an illustrated object. The image produced has a linear magnification of 14. Calculate the power of the lens in dioptres

A. 2.5D B. 5.0D C. 10.0D D. 25.0D Correct Answer: Option C C. 10.0D Explanation 1/v=1/u m = v/u=14=v/50 v…

6 years ago

A concave mirror forms a magnified and erect image only when the object is placed?

A. at the centre of curvature B. at the focus C. between the focus and the pole of the mirror…

6 years ago

The angle of incidence of a ray of light on a plane mirror is 55°. Determine the angle between the reflected ray and the mirror?

A. 35° B. 45° C. 55° D. 110° Correct Answer: Option A A. 35°

6 years ago

A faulty thermometer registers 102.5°C t 100°C. If the thermometer has no zero hour, what will it register at 55°C?

A. 54.6°C B. 55.0°C C. 56.0°C D. 56.4°C Correct Answer: Option D D. 56.4°C Explanation x = (102.5×55)/100 = 56.375°C

6 years ago

A machine of efficiency 80% is used to lift a box. If the effort applied by the machine is twice the weight of the box. Calculate the velocity ratio of the machine?

A. 0.50 B. 0.63 C. 0.80 D. 1.60 Correct Answer: Option B B. 0.63

6 years ago

A stone of mass 0.5kg is dropped from a height of 12m. Calculate its maximum kinetic energy. [g = 10ms‾¹]

A. 3.0J B. 6.0J C. 30.0j D. 60.0J Correct Answer: Option D D. 60.0J Explanation K.E = P.E = mgh…

6 years ago

Electric energy is measured in?

A. ampere B. coulomb C. kilowatt-hour D. kilowatt Correct Answer: Option C C. kilowatt-hour

6 years ago

A body of mass 5kg moving with a velocity of 30ms‾¹ due east is suddenly hit by another body and changes its velocity to 50ms‾¹ in the same direction. Calculate the magnitude of the impulse received.

A. 100Ns B. 150Ns C. 250Ns D. 400Ns Correct Answer: Option A A. 100Ns Explanation I = Ft = m(v…

6 years ago
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