1. The common weed which grows along with every crop is:
a) Amaranthus
b) Chenopodium
c) Convolvulus
d) Wild oat

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2. The practice of keeping the field free for a season to replenish the lost nutrients is:
a) Field fallow
b) Monocropping
c) Crop rotation
d) Multiple cropping

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1. Which fungal spores land on a piece of bread left on a table after a few days , the bread becomes mouldy . What conditions favour the growth of the fungus ?
    I The presence of food
    II The moist temperature
    III The absence of water
a) I only
b) I and II only
c) II and III only
d) I, II and III

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2. The disease caused by virus which affects the liver cells and damages the bilirubin releasing cells is:
a) Hepatitis
b) Polio
c) Influenza
d) Measles

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1. The plastic product which can be remoulded:
a) Polythene
b) Bakelite
c) Melamine
d) Polycot

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2. The sorter disease is caused by a bacteria:
a) Bacillus
b) Anthrax
c) Virus
d) Aedes

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1. Mercury is used in thermometers because :
a) it does not wet the glass
b) it expands on heating
c) it is a liquid
d) all if these

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2. Fe₂O₃ is the chemical formula of:
a) monazite
b) magnetite
c) haematite
d) bauxite

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1. ____________energy in plants is used by man in the form of food .
a) Chemical
b) Electrical
c) Bio
d) Physical

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2. Crude oil is a complex mixture of:
a) Solid hydrocarbons
b) Liquid hydrocarbons
c) Gaseous hydrocarbons
d) All of these

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1. Combustion is an:
a) Endothermic reaction
b) Exothermic reaction
c) Displacement reaction
d) Reduction reaction

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2. In foam type fire extinguisher__________is present in bottle.
a) NaHCO₃
b) Al₂(SO₄)₃
c) AI (OH)₃
d) Na₂SO₄

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1. Which are the factors that pose a great threat to biodiversity?
a) Habitat destruction
b) Disturbance and introduction of alien species
c) Man interference with nature
d) All of these

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2. Conservation of resources means:
a) maintaining the earths resources in their original state
b) using earths resources wisely
c) using resources not in a wasteful manner
d) both B & C

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1. Which of the following organelle acts as digestive system within the cell?
a) Glogi bodies
b) Centrosomes
c) Lysosomes
d) Mitochondria

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2. The structure found only in animal cells, which regulate cell division is :
a) chromosomes
b) chromatin
c) centreosome
d) spindle fibrils

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1. Sperms mature in the:
a) Epididymis
b) Testes
c) Vasdeference
d) Cowper glands

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2. Fertilization is external in:
a) Fish and amphians
b) Birds and fish
c) Amphibians and birds
d) Reptiles and fish

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1. Insufficient production of insulin in the human body causes:
a) Diabetes
b) Cretinism
c) Myxedema
d) Addison disease

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2. A person goes through the following stages of growth. Which is the correct sequence?
1.Foetus
2. Zygote
3. Embryo
4. Baby
5. Adult
6. Adolescent
7.Child
a) 2,3,1,4,7,6,5
b) 2,1,3,4,7,5,6
c) 3,2,1,4,6,7,5
d) 1,3,2,4,7,6,5

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1. We use a straw (narrow pipe) to drink juice from a glass. this is possible due to presence of:
a) Atmospheric pressure
b) Liquid pressure
c) Gravitational pull
d) All of the above

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2. The atmospheric pressure is due to the :
a) sky above our head
b) air mass surrounding earth
c) gravitational force of sun and other planets
d) mass of the earth

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1. The value of sliding friction fot the object shown in figure 2 is :
a) f = 5 N
b) f > 5 N
c) f < 5 N
d) 10 N

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2. A meteor burns up on entering earth atmosphere due to:
a) Excessive friction
b) Atmospheric pressure
c) Heat of the earth
d) Solar radiation

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1. Hertz stands for:
a) Second
b) Meter
c) Meter^-1
d) Second^-1

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2. If you go on increasing the stretching force on a wire in a guitar, its frequency.
a) Decreases
b) Increases
c) Remains unchanged
d) None of the above

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1. In electrolytic solutions, carrier of charge is:
a) Ion
b) Proton
c) Electron
d) Neutron

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2. When current is passed through molten sodium chloride:
a) Sodium is deposited at the negative electrode and the chlorine gas is formed at the positive electrode
b) Sodium is deposited at the positive electrode and chlorine gas is formed at the negative electrode
c) Sodium is evaporated and chloride ions are formed at the negative electrode
d) Sodium is deposited at the positive electrode and chlorine is deposited at the negative electrode

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1. Wind currents are generated due to :
a) shape of earth
b) change in atmospheric pressure
c) thunderstorm
d) cyclone

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2. A negatively charged rod is brought close to two spheres which are in contact with each other, and the spheres are separated in the presence of the rod . Then
a) the sphere close to the rod acquires a negative charges and the other sphere acquires a positive charge
b) the sphere close to the rod acquires a positive charge and the other sphere acquires a negative charge
c) both the spheres will acquire positive charge
d) both the spheres will acquire negative charge

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1. When the angle between two plane mirrors is 60, how many multiple images will be formed by the mirrors?
a) 5
b) 6
c) 7
d) 8

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2. The Persistence of the eye is only for:
a) 1/16th of a second
b) 1/10th of a second
c) 1/12th second
d) 1/20th of a second

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1. Jupiter is a/an :
a) terrestrial planet
b) gas planet
c) asteroid
d) hottest planet

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2. Name the brightest non-star visible to human eye .
a) Moon
b) Venus
c) Mars
d) Jupiter

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1. Carbon monoxide emitted by automobiles prevents oxygen transport to body tissues by:
a) Forming a stable compound with haemoglobin
b) Changing O₂ to CO₂
c) Destroying haemoglobin
d) Obstructing the reaction of oxygen with haemoglobin

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2. What is the main source of water pollution in India ?
a) Discharge of untreated sewage
b) Bathing
c) Discharge of industrial waste
d) Both A and C

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