Q. Which one of the following substances is the hardest?
1) Dimond
2) Brass
3) Steel
4) Iron
Q. Which instrument is used to measure electric current?
1) Voltmeter
2) Ammeter
3) Electrometer
4) Hydrometer
Q. Which of the following is a good conductor of electricity?
1) P.V.C
2) Glass
3) Rubber
4) Graphite
Q. An electric motor converts -
1) electrical energy into heat energy
2) electrical energy into mechanical energy
3) mechanical energy into electrical energy
4) mechanical energy into heat energy
Q. The resistance of metallic conductors -
1) increases with rising in temperature
2) decreases with rising in temperature
3) remains unchanged with change in temperature
4) becomes zero at very high temperature
Q. Which of the colours of visible light has minimum frequency?
1) Violet
2) Red
3) Yellow
4) Green
Q. Which of the following is one of the main causes of tides?
1) Gravitational pull of the Sun and the Moon
2) Closed orbits of planets
3) Rotation of Earth
4) Solar flares
Q. A circular metal piece with a hole in the centre is heated. The size of the hole will -
1) Increase
2) Decrease
3) Remains of the same size
4) Depends on the metal
Q. Which of the following is a physical change?
1) Oxidation
2) Decomposition
3) Sublimation
4) Reduction
Q. Low ionization energy is a characteristic of -
1) Inert gas
2) Metalloids
3) None-metal
4) Metal
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