# Physics Past Questions | JAMB, WAEC, NECO and Post UTME Past Questions

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### Question 4761

A boy receives the echo of his clap reflected by a nearby hill 0.8s later. If the speed of sound in air is 3.40ms$$^-1$$, how far is he from the hill?

A) 66m

B) 136m

C) 264m

D) 528m

### Question 4762

The critical angle for light travelling from a transparent medium to air s measured as 340. The refractive index of the medium is

A) 0.56

B) 1.50

C) 1.79

D) 2.02

### Question 4763

The amount of heat required to raise the temperature of a body is

### Options

A) Thermal energy

B) thermal conduction

C) heat loss

D) specific heat capacity

E) thermal capacity

### Question 4764

A bead traveling on a straight wire is brought to rest at 0.2m by friction. If the mass of the bead is 0.01kg and the coefficient of friction between the bead and the wire is 0.1 determine the work done by the friction

### Options

A) $$2 \times 10^{-4}J$$

B) $$2 \times 10^{-3}J$$

C) $$2 \times 10^{1}J$$

D) $$2 \times 10^{2}J$$

### Question 4765

The limiting frictional force between two surface depends on

I. the normal reaction between the surfaces

II. the area of surface in contact

III. the relative velocity between the surfaces

IV. the nature of the surface

A) I only

B) I and IV only

C) II only

D) III only

### Question 4766

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

### Question 4767

When blue and green colours of light are mixed, the resultant colour is

A) cyan

B) magenta

C) black

D) yellow

### Question 4768

A metal rod has a length of 100cm at 200$$^oC$$. At what temperature will its length be 99.4cm. If the linear expansivity of the material of the rod is 2 $$\times$$ 10$$^{-5}C^{-1}$$

### Options

A) 200$$^o$$C

B) 300$$^o$$C

C) 100$$^o$$C

D) -100$$^o$$C

### Question 4769

According to kinetic molecular model, in gases

### Options

A) The molecules are very fast apart and occupy all the space made available.

B) The particles occur in clusters with molecules slightly farther apart.

C) The particles are closely packed together, they occupy minimum space and are usually arranged in a regular pattern.

D) The particles vibrate about fixed positions and are held together by the strong inter-molecular bond between them.

### Question 4770

The value of T in the figure above is

A) 30N

B) 10.0N

C) 20N

D) 40N