The resistance of a body to change its direction of motion is

(a)

force

(b)

momentum

(c)

inertia of motion

(d)

inertia of direction

On a rainy day, small oily films on water show brilliant colours. This is due to

(a)

scattering

(b)

dispersion

(c)

reflection

(d)

refraction

Increase in area due to heating is called

(a)

Linear expansion

(b)

Superficial expansion

(c)

Cubical expansion

(d)

real expansion

The resistance of a conductor is inversely proportional to its _______.

(a)

Volt

(b)

Length

(c)

Area

(d)

None of the above

By convention, the direction of current is taken as the direction of flow of _______ charge.

(a)

Protons

(b)

neutrons

(c)

electrons

(d)

positrons

Earthquake produces ______.

(a)

Ultrasound

(b)

Infrasound

(c)

audible sound

(d)

none

Fusion reaction takes place at high temp.

(a)

atoms are ionised

(b)

molecules break up

(c)

nuclei break up

(d)

to overcome repulsion between nuclei

Identify the 'hetero nuclear tri atomic molecule' among the following.

(a)

P₄

(b)

H₂SO₄

(c)

CO₂

(d)

O₃

The first period of the modern periodic table has ________ elements.

(a)

1

(b)

2

(c)

3

(d)

8

Quick lime is dissolved in water is a ______________ process.

(a)

exothermic

(b)

endothermic

(c)

reversible

(d)

both (a) and (b)