A brass rod is 2m long at a certain temperature. What is the length for a temperature rise of 100K, if the expansivity of brass is 18 x 10^-6K^-1?

• A. 2.0036m
• B. 2.0018cm
• C. 2.1800
• D. 2.0360m

Which of the following statements explains lost volt in an electric circuit? The

• A. total p.d from a source to maintain a flow of current through the circuit as well as the source
• B. p.d to drive current through the circuit component except the source
• C. p.d across all external components connected to the source of electricity
• D. p.d across the internal resistance of the cell

Two 50\(\mu\)F parallel plate capacitors are connected in series. The combined capacitor is then connected across a 100-V battery. The charge on each plate of the capacitor is

• A. 5.00 x 10^-5C
• B. 2.50 x 10^-3C
• C. 1.25 x 10^-3C
• D. 1.00 x 10^-2C

A converging lens of focal length 5cm is used as a magnifying glass by a man whose nearpoint is 35cm. Calculate the magnification given by the lens

• A. 8
• B. 7
• C. 6
• D. 5

A bulb marked 240V, 40W is used for 30 minutes. Calculate the heat generated

• A. 320J
• B. 400J
• C. 10800J
• D. 72000J

The magnitude of the force required to make an object of mass, m move with speed, v in a circular of radius r is given by the expression

• A. \(\frac{mr}{v}\)
• B. \(\frac{mr^2}{v}\)
• C. \(\frac{mv^2}{r}\)
• D. \(\frac{mv}{r^2}\)

If silicon is doped with phosphorus, what type of semiconductor material will be formed?

• A. Zener material
• B. P-n junction
• C. n-type
• D. p-type

The effect of a particle in a fluid attaining its terminal velocity is that the

• A. acceleration is maximum
• B. weight is equal to the retarding force
• C. buoyancy force is equal to the to the viscous retardind force
• D. buoyancy force is more than the weight of the fluid displaced

Which of the following statements is CORRECT about the earth's magnetic field?

• A. the angle of dip is the angle which a freely suspended magnet makes with the vertical
• B. the angle of declination is the angle between the magnetic meridian and the geographic meridian
• C. the angle of declination is the angle which a magnetic compass makes with the magnetic meridian
• D. the angle of inclination is the difference between the angle of dip and the angle of declination

A stone and a feather are dropped from the same height above the earth surface. Ignoring air resistance, which of the following is correct?

• A. the feather will be blown away by the wind while stone will drop steadily
• B. the stone and the feather will both reach the ground at the same time
• C. the feather will reach the ground first
• D. the stone will reach the ground first