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STD VIII - Science (III)

Name

Class

ITS ID

Which force will act between two charged objects?

Gravitational force

Electrostatic force

Frictional force

Muscular force

The dark zone of a candle flame is the ________.

Region around the wick

Base clock to wick

Middle region of flame

Outer region of flame

Incompletely burnt fuel releases a very poisonous gas that can be fatal if inhaled is __________.

Carbon dioxide

Ozone

Carbon monoxide

Water gas

Deoxyribonucleic acid is found to be present within _________.

Endoplasmic reticulum

Nucleus

Lysosome

Ribosome

The process by which mature ovum is released from ovary is called _______.

Oogenesis

Oogamy

Fertilisation

Ovulation

Which of the following is/are metalloid?

Silicon

Iodine

Both (a) and (b)

D) Gallium

Which of the following is/are noble gas?

Hydrogen

Argon

Neon

Both (b) and (c)

A reaction in which more reactive metal replaces a less reactive metal from its salt solution is called __________.

Addition reaction

Double displacement reaction

Exothermic reaction

Displacement reaction

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 pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to __________.

Pressure of water

Gravity of the earth

Shape of rubber bulb

Atmospheric pressure

The unit of calorific value is __________.

Joule

Joule/Kilogram

Kilojoule/Kg

None of these

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