The joule is equivalent to?

• A. Kg m\(^{2}\) s\(^{-1}\)
• B. Kg\(^{2}\) m s\(^{-2}\)
• C. Kg m\(^{2}\) s\(^{-2}\)
• D. Kg m s\(^{-1}\)

The branch of physics that deals with the motion of objects and the forces acting on them is called:

• A. Electromagnetism
• B. Thermodynamics
• C. Mechanics
• D. Quantum mechanics

The diagram represents a block-and-tackle pulley system on which an effort of 50N is just able to lift a load of weight W. If the efficiency of the machine is 40%. find the value of W

• A. 300N
• B. 200N
• C. 140N
• D. 120N

In a gas experiment, if the volume of the gas is plotted against the reciprocal of the pressure, the unit of the slope of the resulting curve is

• A) force
• B) temperature
• C) power
• D) work

The refractive index of a medium relative to air is 1.8. Calculate the critical angle for the medium to the nearest degree.

• A. 18°
• B. 34°
• C. 45°
• D. 68°

A solid weighs 10.00N in air, 6N when forcefully immersed in water, and 7.0N when fully immersed in a liquid, X. Calculate the relative density of the liquid X.

• A. 5/3
• B. 4/3
• C. 3/4
• D. 7/10

1kg of copper is transferred quickly from boiling water to a block of ice. Calculate the mass of ice melted, neglecting heat loss. [specific heat capacity of copper 400Jkg^-1K^-1 and latent heat of fusion of ice 333 x 10³Jkg^-1]

• A. 60g
• B. 67g
• C. 120g
• D. 133g

If a convex lens of focal length 12cm is used to produce a real image four times the size of the object, how far from the lens must the object be placed?

• A) 10 cm
• B) 15 cm
• C) 20 cm
• D) 25 cm

Which of the following pairs is part of the electromagnetic spectrum?

I. Radio waves

II. sound waves

III. Gamma rays

IV. water waves

• A. I and II
• B. III and IV
• C. I and III
• D. II and IV

What type of electromagnetic radiation can be used to take photographs in the haze?

• A. Radio waves
• B. infrared rays
• C. Visible light
• D. Gamma rays