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 gravitational force between two objects becomes _______ when the masses of both objects are halved without altering the distance between them.

(a)

\(\frac{f}{4}\)

(b)

\(\frac{f}{2}\)

(c)

f

(d)

2f

The eye defect ‘presbyopia’ can be corrected by

(a)

convex lens

(b)

concave lens

(c)

convex mirror

(d)

Bi focal lenses

Kilowatt hour is the unit of

(a)

resistivity

(b)

conductivity

(c)

electrical energy

(d)

electrical power

If a sound wave travels with a frequency of 1.25 x 10⁴ Hz at 344 ms^-1, the wavelength will be 

(a)

27.52 m

(b)

275.2 m

(c)

0.02752 m

(d)

2.752 m

What is the frequency range of audible sound?

(a)

20 Hz to 20 kHz

(b)

1.5 Hz to 20 kHz

(c)

10 Hz to 15 kHz

(d)

20 Hz to 25 kHz

Kamini reactor is located at __________

(a)

Kalpakkam

(b)

Koodankulam

(c)

Mumbai

(d)

Rajasthan

Natural uranium consists of _________ % of U²³⁵ and _______ % of U²³⁸.

(a)

0.72,99.28

(b)

99.28,0.72

(c)

77.28,72

(d)

72, 77.28

The volume occupied by 1 mole of a diatomic gas at S.T.P is

(a)

11.2 liters

(b)

5.6 liters

(c)

22.4 liters

(d)

44.8 liters

In the aluminothermic process the role of Al is _____.

(a)

oxidizing agent

(b)

reducing agent

(c)

hydrogenating agent

(d)

sulphurising agent

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 25% alcohol solution means 

(a)

25 ml alcohol in 100 ml of water

(b)

25 ml alcohol in 25 ml of water

(c)

25 ml alcohol in 75 ml of water

(d)

75 ml alcohol in 25 ml of water

Which of the following represents a precipitation reaction?

(a)

A_(s) + B_(s) → C_(s) + D_(s)

(b)

A_(s) + B_(aq) → C_(aq) + D_(l)

(c)

A_(aq) + B_(aq) → C_(s) + D_(aq)

(d)

A_(aq) + B_(s) → C_(aq) + D_(l)

The product formed when calcium oxide reacts with water is

(a)

Slaked lime

(b)

Carbon dioxide

(c)

Calcium oxide

(d)

Oxygen gas

TFM in soaps represents ___________ content in soap

(a)

mineral

(b)

vitamin

(c)

fatty acid

(d)

carbohydrate

When ethanol reacts with acidified K₂Cr₂O₇ the orange color of K₂Cr₂O₇ changes to _____________

(a)

yellow

(b)

red

(c)

purple

(d)

green

The brain of leech lies above the

(a)

Mouth

(b)

Buccal Cavity

(c)

Pharynx

(d)

Crop

The wall of human heart is made of

(a)

Endocardium

(b)

Epicardium

(c)

Myocardium

(d)

All of the above

The _________are the largest of leucocytes.

(a)

neutrophil

(b)

monocyte

(c)

basophil

(d)

lymphocyte·

The neurons which carries impulse from the central nervous system to the muscle fibre.

(a)

afferent neurons

(b)

association neurons

(c)

efferent neurons

(d)

unipolar neurons

______ is a growth inhibitor.

(a)

Auxin

(b)

GA

(c)

Cytokinin

(d)

Ethylene

Asexual reproduction takes place through budding in ___________

(a)

Amoeba

(b)

Yeast

(c)

Plasmodium

(d)

Bacteria

Pollination with the help of insects like honey bees, flies are called_________

(a)

Entomophilly

(b)

Anemophily

(c)

Hydrophily

(d)

Zoophily

Lack of menstruation generally indicates________

(a)

Pregnancy

(b)

Anemia

(c)

Amenorrhea

(d)

Over weight

The _____________ units form the backbone of the DNA.

(a)

5 Carbon sugar

(b)

Phosphate

(c)

Nitrogenous bases

(d)

Sugar phosphate

Hydrogen bonds between the nitrogeneous bases make the DNA molecule________

(a)

unstable

(b)

stable

(c)

unbalanced

(d)

disturbed

Minerals like __________ slowly penetrate in and replace the original organic tissue and forms a rock like fossil.

(a)

calcium

(b)

sodium

(c)

magnesium

(d)

silica

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)

________ is father of "Indian Green Revolution"

(a)

Dr. M. S. Swaminathan

(b)

Dr. Norman

(c)

Alec Jeffrey

(d)

Dr. Ian Wilmut

Coronary heart disease is due to

(a)

Streptococci bacteria

(b)

Inflammation of pericardium

(c)

Weakening of heart valves

(d)

Insufficient blood supply to heart muscles

World AIDS Day is observed on ______________

(a)

1^st December

(b)

15^th December

(c)

24^th November

(d)

1^st May 

A cheap, conventional, commercial and inexhaustible source of energy is

(a)

hydropower

(b)

solar energy

(c)

wind energy

(d)

thermal energy

Wild life preservation society of India is located in_______

(a)

Delhi

(b)

Uttarakhand

(c)

Dehradun

(d)

Chattisgarh

In Scratch, the characters are known as_________

(a)

Sprite

(b)

Stage

(c)

Element

(d)

Script