Which of the following statements is not true for organic manure?

1

(a)

It enhances water holding capacity of soil

(b)

It has a balance of all plant nutrients

(c)

It provides humus to soil

(d)

It improves texture of soil

Watering the crops is called

1

(a)

sowing

(b)

manuring

(c)

tilling

(d)

irrigation

2,4-D is a

1

(a)

pesticides

(b)

insecticides

(c)

fungicides

(d)

weedicides

The monsoon season in our country is during the months

1

(a)

April-December

(b)

June-September

(c)

November-March

(d)

January-May

The use of manure (which is not correct) :

1

(a)

Enhances the water-holding capacity of the soil

(b)

Improves soil texture

(c)

Increases the number of friendly microbes

(d)

Also becomes a source of water pollution

Yeast is used in the production of

1

(a)

sugar

(b)

alcohol

(c)

hydrochloric acid

(d)

oxygen

The following is an antibiotic

1

(a)

sodium bicarbonate

(b)

streptomycin

(c)

alcohol

(d)

yeast

Alcohol is produced with the help of

1

(a)

sodium chloride

(b)

yeast

(c)

nitrogen

(d)

carbon dioxide

A disease in human beings caused by virus is

1

(a)

typhoid

(b)

influenza

(c)

dysentery

(d)

cholera

Viruses reproduce only inside the cells of :

1

(a)

host organism

(b)

Only surface of microbes

(c)

plants

(d)

animals

Polycot is obtained by mixing

1

(a)

nylon and wool

(b)

polyester and wool

(c)

nylon and cotton

(d)

polyester and cotton

Which of the following groups contains all synthetic substances?

1

(a)

Nylon, terylene, wool

(b)

Cotton, polycot, rayon

(c)

PVC, polythene, bakelite

(d)

Acrylic, silk, wool

Rayon is different from synthetic fibres because:

1

(a)

It has silk-like appearance.

(b)

It is obtained from wood pulp.

(c)

Its fibres can also be woven like those of natural fibres.

Which is not made from nylon?

1

(a)

socks

(b)

rope

(c)

bottles

(d)

tents

The polyester is made up of:

1

(a)

nylon

(b)

rayon

(c)

esters

(d)

cotton.

Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces.Which of the following is non-metal?

1

(a)

Iron nail

(b)

Aluminium wire

(c)

Copper plate

(d)

Piece of coal

The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is

1

(a)

copper

(b)

iron

(c)

aluminium

(d)

sodium

The most reactive metal is

1

(a)

gold

(b)

copper

(c)

potassium

(d)

zinc

Which of the following is very hard?

1

(a)

Copper

(b)

Sodium

(c)

Potassium

(d)

Coal

Which statement is not correct for non-metals?

1

(a)

Non-metals do not react with acids

(b)

Non-metals are not ductile

(c)

Non-metals are not sonorous

(d)

Non-metals can be drawn into wires

Which substance is formed by the carbonisation of dead vegetation?

1

(a)

Coal

(b)

Coke

(c)

Coal gas

(d)

Coal tar

Choose the correct statement from the following.

1

(a)

It is difficult to transport natural gas through pipes

(b)

The disadvantage of natural gas is that it cannot be used directly for burning in homes

(c)

Natural gas is stored under high pressure as compressed natural gas

(d)

Natural gas cannot be used for power generation

PCRA stands for:

1

(a)

Public Conservation Research Association

(b)

Petroleum Conservation Research Association

(c)

Public Council of Research Association

(d)

Partial Counting of Remaining Amendment.

Which is not an exhaustible natural resource?

1

(a)

Sunlight

(b)

Petroleum

(c)

Natural gas

(d)

Wildlife

It was used for street lighting for the first time in London.

1

(a)

Coke

(b)

Coal-tar

(c)

Coal gas

(d)

Petrol

Magnesium ribbon on burning in air produces

1

(a)

magnesium oxide, water and light

(b)

magnesium oxide and heat

(c)

magnesium oxide, heat and light

(d)

magnesium oxide, water and heat

If a person's clothes catch fire. The best way to extinguish the fire is to

1

(a)

throw water on the clothes

(b)

use fire extinguisher

(c)

cover the person with a woolen blanket

(d)

cover the person with a polythene sheet

The calorific value of a fuel is expressed in a unit called

1

(a)

kilojoule per litre

(b)

kilogram per millilitre

(c)

kilojoule per gram

(d)

kilojoule per kilogram

In villages people use wood as fuel because

1

(a)

it is considered to be an ideal fuel

(b)

of its easy availability and low cost

(c)

it is environment friendly

(d)

it catches fire easily

The product(s) of combustion is/are

1

(a)

only oxygen

(b)

oxygen and water

(c)

carbon dioxide and water

(d)

only carbon dioxide

Which one of the following statements is true about a biosphere reserve?

1

(a)

It is a protected area where only endemic species live

(b)

It is meant only for the conservation of plants and animals

(c)

It is meant to conserve both, the biodiversity and  the culture of that area

(d)

there are no other protected areas within its  limits

The Siberian crane comes to India every year in winter for a few months. 

1

(a)

To escape the severe summer

(b)

To escape the severe winter

(c)

To escape the heavy rains

(d)

To escape from predators

Which one of the following changes may occur due to desertification?

1

(a)

Decrease in atmospheric temperature

(b)

Increase in water holding capacity of soil

(c)

Increased chances of floods

(d)

Conversion of fertile land into a desert

Deforestation increases the level of one of the following the atmosphere.

1

(a)

Ozone

(b)

Carbon dioxide

(c)

Oxygen

(d)

Water vapour

The Red Data Book keeps a record of all the
(i) endemic species
(ii) endangered plants
(iii) extinct species
(iv) endangered animals

1

(a)

(i) and (ii)

(b)

(ii) and (iii)

(c)

(iii) and (iv)

(d)

(i) and (iv)

Which one of the following statements is true about endemic species?

1

(a)

They are found exclusively in a specific habitat

(b)

Endemic species can never become endangered.

(c)

They are found only in zoos and botanical gardens.

(d)

They are not affected by the destruction of their habitat.

In our country, large patches of forests are being cleared for cultivation of crops. The environmental impact of such a practice will lead to :

1

(a)

Soil erosion

(b)

Soil pollution

(c)

Soil conservation

(d)

Soil fertility.

A suitable term for the various components of cells is

1

(a)

tissue

(b)

cell organelles

(c)

chromosomes

(d)

genes

Choose the correct statements.

1

(a)

Genes are located in the chromosomes

(b)

Cell is located in the nucleus

(c)

Chromosomes are located in the nucleolus

(d)

Cell membrane surrounds the nucleus

Majority of cells cannot be seen directly with our naked eyes because

1

(a)

organisms are generally unicellular

(b)

cells are microscopic

(c)

cells are present only inside the body

(d)

cells are grouped into tissue

The jelly-like fluid substance present in cells is called

1

(a)

protoplasm

(b)

chloroplast

(c)

chromosome

(d)

cytoplasm

Read the following terms and select the pair that is related to inheritance of characters

1

(a)

Cell wall and cell membrane

(b)

Chromosome and mitochondria

(c)

Chloroplast and cell membrane

(d)

Chromosome and genes

Which of the following is not a part of the human male reproductive system?

1

(a)

Testes

(b)

Oviducts

(c)

Seminal vesicles

(d)

Epididymis

Which of the following is not a viviparous animal?

1

(a)

Rat

(b)

Lizard

(c)

Rabbit

(d)

Cat

Animals exhibiting external fertilisation produce a large number of gametes. Pick the appropriate reason from the following.

1

(a)

The animals are small in size and want to produce more offsprings

(b)

Food is available in plenty in water

(c)

To ensure better chance of fertilisation

(d)

Water promotes production of large number of gametes

Aquatic animals in which fertilisation occurs in water are said to be

1

(a)

viviparous without fertilisation

(b)

oviparous with external fertilisation

(c)

viviparous with internal fertilisation

(d)

oviparous with internal fertilisation

The production of an exact copy of an animal by asexual reproduction is known as

1

(a)

budding

(b)

mating

(c)

cloning

(d)

hatching

Adolescents should be careful about what they eat, because

1

(a)

proper diet develops their brains.

(b)

proper diet is needed for the rapid growth taking place in their body.

(c)

adolescents feel hungry all the time.

(d)

taste buds are well developed in teenagers.

The right meal for adolescents consists of

1

(a)

chips, noodles, cake

(b)

chapatti, dal, vegetables

(c)

rice, noodles and burger

(d)

vegetable cutlets, chips and lemon drink

The number of chromosomes are present in human cell

1

(a)

22 pairs

(b)

23 pairs

(c)

24 pairs

(d)

26 pairs

The male hormone is

1

(a)

oestrogen

(b)

progesterone

(c)

testosterone

(d)

All of the above

For the metamorphosis of tadpoles which of the following elements must be available in water?

1

(a)

Chlorine

(b)

Carbon

(c)

Sulphur

(d)

Iodine

Which among the following hormones controls calcium metabolism in our body?

1

(a)

Insulin

(b)

parathorme

(c)

Thyroxine

(d)

Adrenaline

The dramatic changes in body features associated with puberty are mainly because of the secretions of
(i) Thyroxine
(ii) Oestrogen
(iii) Adrenaline
(iv) Testosterone

1

(a)

(i) and (ii)

(b)

(ii) and (iii)

(c)

(i) and (iii)

(d)

(ii) and (iv)

The pressure exerted by liquid due to increase in depth

1

(a)

reduces

(b)

increases

(c)

remains same

(d)

depends on the nature of liquid

Force due to the charged particles is known as

1

(a)

muscular force

(b)

magnetic force

(c)

electrostatic force

(d)

gravitational force

During dry weather while combing hair, sometimes we experience hair flying apart. The force responsible for this is

1

(a)

force of gravity

(b)

electrostatic force

(c)

force of friction

(d)

magnetic force

Like poles exert a force of

1

(a)

attraction

(b)

repulsion

(c)

Both (a) and (b)

(d)

None of these

When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to

1

(a)

pressure of water

(b)

gravity of the earth

(c)

shape of rubber bulb

(d)

atmospheric pressure

Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play

1

(a)

only if the objects are solid

(b)

only if one of the two objects is liquid

(c)

only if one of the two objects is gaseous

(d)

irrespective of whether the objects are solids, liquids or gases

We can increase the friction by

1

(a)

polishing

(b)

making grooves and treads

(c)

streamlining

(d)

using ball bearing

If we apply oil on door hinges, the friction will

1

(a)

increase

(b)

decrease

(c)

disappear altogether

(d)

will remain unchanged

Fine powder is poured on the carromboard to

1

(a)

increase friction

(b)

decrease friction

(c)

Both (a) and (b)

(d)

None of these

Rolling friction is smaller than

1

(a)

sliding friction

(b)

static friction

(c)

fluid friction

(d)

All of these

Voice of which of the following is likely to have minimum frequency?

1

(a)

Baby girl

(b)

Baby boy

(c)

A man

(d)

A woman

The hearing range of human ear is

1

(a)

20 Hz to 20 kHz

(b)

less than 20 Hz

(c)

more than 20 kHz

(d)

20 Hz to 25,000 Hz

The loudness of sound depends on

1

(a)

its amplitude

(b)

its time period

(c)

its frequency

(d)

its speed

Sound cannot travel through

1

(a)

solid

(b)

liquid

(c)

air

(d)

vacuum

In order to reduce the loudness of a sound, we have to

1

(a)

decrease its frequency of vibration of the sound

(b)

increase its frequency of vibration of the sound

(c)

decrease its amplitude of vibration of the sound

(d)

increase its amplitude of vibration of the sound

The loudness of sound is determined by its

1

(a)

amplitude of vibration

(b)

ratio of amplitude and frequency of vibration

(c)

frequency of vibration

(d)

product of amplitude and frequency of vibration

Pitch of sound is determined by its

1

(a)

frequency

(b)

speed

(c)

amplitude

(d)

loudness

The maximum displacement of a vibrating body from its mean position is called

1

(a)

frequency

(b)

time period

(c)

amplitude

(d)

None of the above

A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A, while it glows very dimly for liquid B. You would conclude that

1

(a)

liquid A is a better conductor than liquid B

(b)

liquid B is a better conductor than liquid A

(c)

both liquids are equally conducting

(d)

conducting properties of liquid cannot be compared in this manner

On passing electric current through solution of an electrolyte, the solution experiences

1

(a)

magnetic effect

(b)

heating effect

(c)

chemical effect

(d)

None of these

Electrolytes conduct electricity due to the movement of

1

(a)

electrodes

(b)

atoms

(c)

electrons

(d)

ions

The device which can be used to detect very small current flowing in an electric circuit is

1

(a)

LEAD

(b)

MCB

(c)

LED

(d)

None of these

Boojho and Paheli performed experiments taking similar bulbs and cells but two different solutions A and B as shown in figure.

They found that the bulb in the set up A glows more brightly as compared to that of the set up B. You would conclude that

1

(a)

higher current is flowing through the circuit in set up A

(b)

higher current is flowing through the circuit in set up B

(c)

equal current is flowing through both the circuits

(d)

the current flowing through the circuits in the two set ups cannot be compared in this manner

An electroscope is a device which is used to find if an object is

1

(a)

charged

(b)

magnetic

(c)

free of cracks

(d)

hot

The like charges

1

(a)

repel each other

(b)

attract each other

(c)

not interaction takes place

(d)

All of the above

Electric current is to be passed from one body to another. For this purpose, the two bodies must be joined by

1

(a)

cotton thread

(b)

plastic string

(c)

copper wire

(d)

rubber band

The earth's plate responsible for causing earthquake is

1

(a)

the crust of the earth

(b)

the mantle of the earth

(c)

the inner core of the earth

(d)

the outer core of the earth

Which of the following can be charged with static electricity?

1

(a)

Alloy

(b)

Metal

(c)

Insulator

(d)

Semiconductor

Angle of incidence is equal to the angle of reflection

1

(a)

Always

(b)

Sometimes

(c)

Under special conditions

(d)

Never

Image formed by a plane mirror is

1

(a)

virtual, behind the mirror and enlarged

(b)

virtual, behind the mirror and of the same sizeas the object

(c)

real at the surface of the mirror and enlarged.

(d)

real, behind the mirror and of the same sizeas the object

A person cannot see the distant objects clearly, (though) he can see the nearby object clearly. He is suffering from the defect of vision called

1

(a)

myopia

(b)

hypermetropia

(c)

cataract

(d)

night blindness

Part of the eye which controls the entering of light is called

1

(a)

iris

(b)

cornea

(c)

lens

(d)

retina

As the angle between two plane mirrors is decreasing gradually, the number of images of an object placed between them

1

(a)

first increases then decreases

(b)

first decreases then increases

(c)

increases

(d)

decreases

A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in figure. The pencil of light coming out of the hole falls on a mirror. At which point should the eye be placed so that the hole can be seen?

1

(a)

A

(b)

B

(c)

C

(d)

D

How does the eye change in order to focus on near or distant objects?

1

(a)

The eye lens moves in or out

(b)

The retina moves in or out

(c)

The eye lens becomes thicker or thinner

(d)

The pupil becomes larger or smaller

The change in converging power of an eye lensis caused by the action of

1

(a)

retina

(b)

optic nerve

(c)

ciliary muscles

(d)

iris

Suppose a new planet is discovered between Uranus and Neptune. Its time period would be

1

(a)

less than that of Neptune

(b)

more than that of Neptune

(c)

equal to that of Neptune or Uranus

(d)

less than that of Uranus

Ursa Major is a

1

(a)

star

(b)

constellation

(c)

seen only with telescope

(d)

satellite

The sun appears to move from east to west around the Earth. This means that earth rotates from

1

(a)

east to west

(b)

west to east

(c)

north to south

(d)

west to north

An astronaut standing on the surface of the moon throws a ball upwards. The ball would

1

(a)

directly fall down from the point it is released

(b)

hang in space

(c)

go up and then come back to the surface of the moon

(d)

keep going up never to come back

Mars appears red due to the presence of large amount of

1

(a)

Iron oxide

(b)

Copper oxide

(c)

calcium oxide

(d)

Aluminium oxide

Which of the following will reach the earth in greater amounts if the amount of chlorofluorocarbons released into the air increases?

1

(a)

Infrared rays

(b)

X-rays

(c)

Gamma rays

(d)

Ultraviolet rays

The phenomenon of 'marble cancer' is due to

1

(a)

soot particles

(b)

CFCs

(c)

log

(d)

acid rain

Highest percentage of air consists of

1

(a)

oxygen

(b)

carbon dioxide

(c)

nitrogen

(d)

argon

The Kyoto protocol is associated with one of the following.

1

(a)

Reduction in the use of chlorofluorocarbons

(b)

Reduction in the emission of greenhouse gases

(c)

Reduction in the cutting of forest trees

(d)

Reduction in pollution of fresh water sources

Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school?

1

(a)

Car

(b)

School bus

(c)

Autorickshaw

(d)

Scooter