If the Earth shrinks to 50% of its real radius its mass remaining the same, the weight of a body on the Earth will

(a)

decrease by 50%

(b)

increase by 50%

(c)

decrease by 25%

(d)

increase by 300%

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

(a)

force

(b)

momentum

(c)

inertia of motion

(d)

inertia of direction

The formula used for Newton's II law of motion

(a)

Force = mass x acceleration

(b)

Velocity = acceleration x time

(c)

Momentum = mass x velocity

(d)

Speed = distance ÷ time

The value of g

(a)

increases as we go above the earth's surface

(b)

decreases as we go to the centre of the earth

(c)

remains constant

(d)

is more at equator and less at poles

Which of the following lens would you prefer to use while reading small letters found in a dictionary?

(a)

A convex lens of focal length 5 cm

(b)

A concave lens of focal length 5 cm

(c)

A convex lens of focal length 10 cm

(d)

A concave lens of focal length 10 cm

The path of light is ______

(a)

rays

(b)

point

(c)

lines

(d)

beam

The scattering of light by colloidal particles is _____  scattering.

(a)

Ray light

(b)

Mie

(c)

Raman

(d)

Tyndall

Real images formed by convex lenses are always

(a)

an the same side of the object

(b)

inverted

(c)

erect

(d)

smaller than the object

The human eye forms the image of an object at its

(a)

Cornea

(b)

Iris

(c)

Pupil

(d)

Retina

A magnifying glass is also called

(a)

Telescope

(b)

Compound microscope

(c)

Simple microscope

(d)

Astronomical telescope

Temperature is a property which determines

(a)

amount of heat a body contains

(b)

total absolute energy a body has

(c)

direction of flow of heat

(d)

thermal energy

The degree of hotness or coldness of a body is called _____

(a)

Energy

(b)

Thermal energy

(c)

Temperature

(d)

Heat capacity

When one of three series resistors is removed from a circuit and the circuit is reconnected the current

(a)

increase by half

(b)

increases

(c)

decreases by half

(d)

none of the above

What happens when ammeter connected in parallel?

(a)

Open circuited

(b)

Closed Circuited

(c)

Short circuited

(d)

None of the above

Before playing guitar, guitarist adjust the tension and pluck the string. By doing so, he is adjusting.

(a)

intensity of sound only

(b)

amplitude

(c)

frequency

(d)

loudness of sound

Artificial radioactivity was discovered by_____

(a)

Becquerel

(b)

Irene Curie

(c)

Roentgen

(d)

Niels Bohr

Kamini reactor is located at __________

(a)

Kalpakkam

(b)

Koodankulam

(c)

Mumbai

(d)

Rajasthan

Nucleons are made of ________.

(a)

atoms

(b)

electrons and protons

(c)

electrons and neutrons

(d)

protons and neutrons

__________ is fissionable by neutrons of all energies.

(a)

U²³⁵

(b)

U²³⁸

(c)

U²³⁹

(d)

Np²³⁹

Mass of an electron is

(a)

9.1083 x 10^-31kg

(b)

9.1083 x 10^-24kg

(c)

1.67262 x 10^-27kg

(d)

1.67 x 10^-24gm

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 basis of modern periodic law is__________.

(a)

atomic number

(b)

atomic mass

(c)

isotopic mass

(d)

number of neutrons

The distance from the centre of the nucleus to the outer most electron in an ion is termed as _________ radii.

(a)

atomic

(b)

ionic

(c)

Covalent

(d)

both (b) and (c)

A beaker contains a solution of copper sulphate. precipitation of copper sulphate takes place when small amount of it added to ________ solution.

(a)

Saturated

(b)

Super saturated

(c)

Unsaturated

(d)

Concentrated

The chemical equation Na₂SO_4(aq) + BaCl_2(aq) → BaSO_4(s)↓ + 2NaCl_(aq) represents which of the following types of reaction?

(a)

Neutralisation

(b)

Combustion

(c)

Precipitation

(d)

Single displacement

Copper displaces - metal from its solution.

(a)

Zn

(b)

AI

(c)

Ag

(d)

all the above

Which of the following statements is wrong about detergents?

(a)

It is a sodium salt of long chain fatty acids

(b)

It is sodium salts of sulphonic acids

(c)

The ionic part in a detergent is –SO₃^–Na⁺

(d)

It is effective even in hard water.

Mammals are ______________ animals.

(a)

Cold blooded

(b)

Warm blooded

(c)

Poikilothermic

(d)

All the above

In reflex action, the reflex arc is formed by

(a)

brain, spinal cord, muscle

(b)

receptor, muscle, spinal cord

(c)

muscle, receptor, brain

(d)

receptor, spinal cord, muscle

To increase the sugar production in sugarcanes they are sprayed with _______

(a)

Auxin

(b)

Cytokinin

(c)

Gibberellins

(d)

Ethylene

Male gametes in angiosperms are formed by the division of ___________

(a)

Generative cell

(b)

Vegetative cell

(c)

Microspore mother cell

(d)

Microspore

The loss of one or more chromosome in a ploidy is called_____________.

(a)

Tetraploidy

(b)

Aneuploidy

(c)

Euploidy

(d)

Polyploidy

Which of the following is used to produce products useful to humans by biotechnology techniques?

(a)

enzyme from organism

(b)

live organism

(c)

vitamins

(d)

both (a) and (b)

Metastasis is associated with

(a)

Malignant tumour

(b)

Benign tumour

(c)

Both (a) and (b)

(d)

Crown gall tumour

Global warming will cause

(a)

raise in level of oceans

(b)

melting of glaciers

(c)

sinking of islands

(d)

all of these