A luggage is usually tied with a rope on the roof of the buses due to

(a)

inertia of motion

(b)

inertia of direction

(c)

inertia of rest

(d)

momentum

What would happen, if the force of gravity disappears suddenly on earth?

(a)

All objects would move in a rapid whirl wing

(b)

All object will float

(c)

not possible

(d)

cannot say

Convex lens produces a ______ beam of light.

(a)

convergent

(b)

divergent

(c)

scattered

(d)

dispersed

The reciprocal of the focal length of the lens is

(a)

Magnification

(b)

Power

(c)

Principal focus

(d)

None

In compound microscope, as compare to eye piece, objective lens has _____ focal length.

(a)

-ve focal length

(b)

Zero

(c)

Small

(d)

Large

Increase in area due to heating is called

(a)

Linear expansion

(b)

Superficial expansion

(c)

Cubical expansion

(d)

real expansion

The relation between potential difference (V) and current (I) was discovered by:

(a)

Volt

(b)

Ohm

(c)

Newton

(d)

Ampere

Why are copper wires used as connecting wires?

(a)

Low resistivity

(b)

Low conductivit

(c)

High Resistivity

(d)

Both A and B

The velocity of sound is affected by

(a)

temperature

(b)

density

(c)

pressure

(d)

all the above

The main source of stellar energy is
(i) fission reactors
(ii) fusion reaction
(iii) chemical reaction
(iv) thermonuclear reactions

(a)

(i) is correct

(b)

(i) & (ii) are correct

(c)

(i) & (iv) are correct

(d)

(ii) & (iv) are correct

A good ________ shows down neutrons by elastic collisions and it does not remove them by absorption.

(a)

fuel

(b)

moderator

(c)

coolant

(d)

control rod

An atom which has a mass number of 14 and 8 neutrons is an

(a)

isotope of nitrogen

(b)

isotope of oxygen

(c)

isotope of carbon

(d)

isobar of carbon

The mass of a molecule of water is:

(a)

3 x 10^-26kg

(b)

3 x 10^-23kg

(c)

1.5 x 10^-26kg

(d)

2.5 x 10^-26kg

The chief ore of copper is ________

(a)

Copper pyrites

(b)

Copper glance

(c)

Cyprite

(d)

Rupy copper

The product formed when calcium oxide reacts with water is

(a)

Slaked lime

(b)

Carbon dioxide

(c)

Calcium oxide

(d)

Oxygen gas

Transpiration does not___________

(a)

help in ascent of sap

(b)

help in keeping cells turgid

(c)

helps in cooling leaves

(d)

helps in translocation

______ is a growth inhibitor.

(a)

Auxin

(b)

GA

(c)

Cytokinin

(d)

Ethylene

Approximately 80% of the pollination done by _________.

(a)

buterflies

(b)

houseflies

(c)

honey bees

(d)

mosquitoes

Most _________ and wood fossils are petrified.

(a)

bone

(b)

soils

(c)

sands

(d)

rocks