Which of the following is not an electromagnetic radiation?

• A. x - ray
• B. Radio waves
• C. sunlight
• D. sound waves

(a) Differentiate between plane polarization and interference as applied to waves.

(b) List two uses of polaroids.

A plane inclined at 30° to the horizontal has an efficiency of 50%. Calculate the force parallel to the plane required to push a load of 120N uniformly upn the plane

• A. 50.0N
• B. 120.0N
• C. 200.0N
• D. 240N

According to kinetic molecular model, in gases

• A. The particles are closely packed together, they occupy minimum space & are usually arranged in a regular pattern
• B. The particles occur in clusters with molecules slightly farther apart
• C. The molecule are very fast apart & occupy all the space made available
• D. The particle vibrate about fixed positions and are held together by the strong intermolecular bonds between them

The nucleon number and the proton number of a neutral atom of an element are 23 and 11 respectively. How many neutrons are present in the atom?

• A. 11
• B. 12
• C. 23
• D. 34

A lamp is rated 240 V, 60 W. Determine the resistance of the lamp when lit?

• A. 120Ω
• B. 240Ω
• C. 540Ω
• D. 960Ω

Which of the following factors can affect the speed of sound in air? i. The temperature of the surrounding ii. The direction of the wind iii. The pitch of the sound.

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

When the brakes in a car are applied, the frictional force force on the tyres is

• A. is a disadvantage because it is in the direction of the motion of the car
• B. is a disadvantage because it is in the opposite direction of the motion of the car
• C. is an advantage because it is in the direction of the motion of the car
• D. is an advantage because it is in the opposite direction of the motion of the car

If \(\theta\) is equal to \(\alpha\) at the time the box is just about to slide down the plank, the coefficient of static friction between the plank and box is

• A. sin\(\alpha\)
• B. cos\(\alpha\)
• C. tan\(\alpha\)
• D. sec\(\alpha\)

How far will a body move in 4 seconds if uniformly accelerated from rest at the rate of 2 ms^-2?

• A. 32m
• B. 24m
• C. 16m
• D. 1.2m