Which of the following statements about solid friction are correct? It i. is a force ii. occurs between the surfaces of two bodies in contact iii. depends on the area in contact

• A. i and ii only
• B. i and iii only
• C. ii and iii only
• D. i, ii and iii

If an object is placed between two parallel plane mirrors with their reflecting surfaces facing each other, how many images of the object will be formed?

• A. Infinite
• B. Eight
• C. Four
• D. Two

A metre rule is pivoted at its mid-point with a vertical force of 10N hanging from the distance 30cm from the mid-point. At what distance must a 15N force hang to balance the ruler horizontally?

• A. 30cm
• B. 10cm
• C. 20cm
• D. 25m

Which of the following statements is not correct about steel and soft iron?

• A. steel is more magnetized than soft iron
• B. permanent magnets are usually made of steel
• C. soft iron is more readily magnetized than steel
• D. soft iron more readily loses its magnetism than steel

If a body moves with a constant speed and at the same time undergoes an acceleration, its motion is said to be

• A. oscillation
• B. circular
• C. rotational
• D. rectilinear

(a) Explain the term electrodes in electric cells.

b) An electric current passing through an electrolyte for 2 minutes deposited 200 g of a substance. If the electrochemical equivalent of the substance is 8.33 x 10\(^{-4}\)g C\(^{-1}\), calculate the current passed.

Which of the following statements are TRUE about frictional force? i. it is always a disadvantage ii. it is sometimes a disadvantage iii. it always exist where there is a relative motion of two bodies that are in contact iv. it is sometimes very useful

• A. i, iii only
• B. i, iv only
• C. ii, iii only
• D. iii, iv only

The correct relationship between the displacement, s, of a particle initially at rest in a linear motion and the time, t, is?

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

Two spanners X and Y of lengths 15cm and 20cm respectively are used in turn to give a screw of pitch 2mm one complete rotation. If Rx and Ry are the respective velocity ratios of the spanners then the ratio Rx : Ry is

• A. 1 : 50
• B. 3 : 20
• C. 3:4
• D. 4:3

What type of reaction is represented by the following scheme? \(^{2}_{1}X + ^{2}_{1}Y \rightarrow ^{3}_{2}Z + 10n + energy\)

• A. fusion reaction
• B. fission reaction
• C. Chain reaction
• D. radioactive decay