BUK Physics 2009/2010 Past Questions

In which of the following materials media would sound travel fastest?

i. wavelength ii. medium of propagation iii. wave of velocity iv. frequency v. energy. Which of the above are used for characterizing waves.

What happens to the rays in a parallel beam of light?

If U is the object distance and V the image distance, which of the following expressions gives linear magnification produced by a convex lens of focal length f?

A ray of light makes an angle of 35°C with a plane mirror. What is the angle of reflection

The pitch of a sound note depends on

If the angle between two vectors P and Q is 0° , the vectors are said to

A machine whose efficiency is 60% has a velocity ratio of 5 If force of 500N is applied to lift a load P, what is the magnitude of P?

In a hydraulic press, a force of 40N is applied on the effort piston of area 0.4m². If the force exerted on the load piston is 400N, the area of the large piston is

A 100kg box is pushed along a road with a force of 500N. If the box moves with a uniform velocity, the coefficient of friction between the box and the road is

The earth is four times the size of the moon and the acceleration due to gravity on the earth is 80 times that on the moon. The ratio of the mass of the moon to that of the earth is

In a reverse biased junction diode, current flows in by

The energy stored in an inductor of inductance 5mH when a current of 6A flows through it is

X-rays can be used in the study of crystal structures because they

An A.C circuit of Emf 12V has a resistor of resistance 8 Ω connected in series to an inductor of inductive resistance 16 Ω and a capacitor of capacitive reactance 10 Ω. The current flow in the circuit is

A generator manufacturing company was contracted to produce an A.C dynamo but inadvertently produced a D.C dynamo. To correct this error, the

Transverse waves can be distinguished from longitudinal waves using the characteristics of

A man exerts a pressure of 2.8×10^-3Nm^-2 on the ground and has 4×10^-2m^-2 of his feet in contact with the ground. The weight of the man is

Which of the following is an electrolyte?

Electrical appliances in homes are normally earthed so that

A cell whose internal resistance is 0.5Ω delivers a current of 4A to an external resistor. The lost voltage of the cell is

When left in a freezer, a bottle full of water cracks on the freezing of the ice because of the

The change in the volume when 450kg of ice is completely melted is

If a force of 50N stretches a wire from 20m to 20.01m, what is the amount of force required to stretch the same material from 20m to 20.05m?

Tea pots are often silver-coated to prevent heat loss by