The bond between silicon and germanium is

• A) dative
• B) covalent bond
• C) trivalent
• D) ionic

A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid? [Density of the cork = 0.25 x 10³kgm^-3, Density of the liquid = 1.25 x 10³kgm^-3]

• A. 0.8
• B. 0.5
• C. 0.2
• D. 0.1

Which of the following distances is usually adjustable in the camera? The distance between the

• A. lens and the film
• B. diaphragm and the shutter
• C. shutter and the film
• D. diaphragm and the film

The potential energy in an elastic string of force constant k, which has an extension X is?

• A. kX
• B. KX\(^{2}\)
• C. 1/2KX\(^{2}\)
• D. 1/2K

Which of the transitions will produce the emission of highest frequency?

• A. V
• B. IV
• C. III
• D. II

I. Refraction II. Interference III. Diffraction Which of the above properties are common to all waves?

• A. II and III only
• B. I, II and III
• C. I and II only
• D. I and III only

Which of the following consists entirely of vector quantities?

• A. Velocity, magnetic fulx and reaction
• B. Tension, magnetic flux and mass
• C. Displacement, impulse and power
• D. Work, pressure and moment

A 3000W electric cooker is to be used on a 200V mains circuit. Which of the fuses below can be used safely with the cooker?

• A. 2A
• B. 5A
• C. 10A
• D. 20A

A string of length 5cm is extended by 0.04m when a load of 0.8kg is suspended at the end. How far will it extend if a force of 16N is applied? [g = 10ms^−2]

• A. 0.04m
• B. 0.12m
• C. 0.01m
• D. 0.08m

(a) State two;

(i) differences between nuclear fusion and nuclear fission;

(ii) peaceful uses of atomic energy

(b)(i) Explain chain reaction

(ii) State (I) one condition necessary for chain reaction to occur.

(II) two components in a nuclear reactor used to control chain reaction.

(c)(i) A nuclear reaction is given \(^2_1H + ^3_1H = ^4_0n\) + energy

What type of nuclear reaction is it?

(ii) The isotope of a nuclide has a half life of 5.40 x 10\(^3\) s, Calculate its decay constant.