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 eye defect ‘presbyopia’ can be corrected by

(a)

convex lens

(b)

concave lens

(c)

convex mirror

(d)

Bi focal lenses

In a simple circuit, why does the bulb glow when you close the switch?

(a)

The switch produces electricity

(b)

Closing the switch completes the circuit.

(c)

Closing the switch breaks the circuit.

(d)

The bulb is getting charged.

Velocity of sound in the atmosphere of a planet is 500 ms^-1. The minimum distance between the sources of sound and the obstacle to hear the echo, should be

(a)

17 m

(b)

20 m

(c)

25 m

(d)

50 m

_____________ aprons are used to protect us from gamma radiations

(a)

Lead oxide

(b)

Iron

(c)

Lead

(d)

Aluminium

Mass of 1 mole of Nitrogen atom is

(a)

28 amu

(b)

14 amu

(c)

28 g

(d)

14 g

Chemical formula of rust is ________.

(a)

FeO.xH₂O

(b)

FeO₄.xH₂O

(c)

Fe₂O₃.xH₂O

(d)

FeO

Solubility of NaCl in 100 ml water is 36 g. If 25 g of salt is dissolved in 100 ml of water how much more salt is required for saturation _____________

(a)

12g

(b)

11g

(c)

16g

(d)

20g

Powdered CaCO₃ reacts more rapidly than flaky CaCO₃ because of __________.

(a)

large surface area

(b)

high pressure

(c)

high concentration

(d)

high temperature

Rectified spirit is an aqueous solution which contains about _______ of ethanol

(a)

95.5 %

(b)

75.5 %

(c)

55.5 %

(d)

45.5 %

Kreb’s cycle takes place in

(a)

chloroplast

(b)

mitochondrial matrix

(c)

stomata

(d)

inner mitochondrial membrane

Mammals are ______________ animals.

(a)

Cold blooded

(b)

Warm blooded

(c)

Poikilothermic

(d)

All the above

Which is the correct sequence of  blood flow

(a)

Ventricle → atrium → vein → arteries

(b)

Atrium → ventricle → veins → arteries

(c)

Atrium → ventricle → arteries → vein

(d)

Ventricles → vein → atrium → arteries

Which nervous band connects the two cerebral hemispheres of brain?

(a)

thalamus

(b)

hypothalamus

(c)

corpus callosum

(d)

pons

LH is secreted by

(a)

Adrenal gland

(b)

Thyroid gland

(c)

Anterior pituitary

(d)

Hypothalamus.

Male gametes in angiosperms are formed by the division of ___________

(a)

Generative cell

(b)

Vegetative cell

(c)

Microspore mother cell

(d)

Microspore

Okasaki fragments are joined together by ___________________.

(a)

Helicase

(b)

DNA polymerase

(c)

RNA primer

(d)

DNA ligase

Himgiri developed by hybridisation and selection for disease resistance against rust pathogens is a variety of _______.

(a)

chilli

(b)

maize

(c)

sugarcane

(d)

wheat

Cancer cells are more easily damaged by radiations than normal cells because they are

(a)

Different in structure

(b)

Non dividing

(c)

Mutated Cells

(d)

Undergoing rapid division

Global warming will cause

(a)

raise in level of oceans

(b)

melting of glaciers

(c)

sinking of islands

(d)

all of these