Q. 'Misch metal' is widely used in the manufacture of which of the following?
1) Material of car brake
2) Smoke detectors
3) Cigarette lighters
4) Emergency lights
Q. The electric charge is stored in a device called -
1) Inductor
2) Capacitor
3) Resistor
4) Transformer
Q. A primary rainbow is formed when light suffers -
1) two internal refractions before emerging out of the drop
2) one internal refraction before emerging out of the drop
3) on internal refraction
4) either one or two internal refractions before emerging out of the drop
Q. Which of the following colours has got the maximum refractive index for glass?
1) Blue
2) Green
3) Red
4) Indigo
Q. What is the function of a dynamo?
1) To convert heat energy into light energy
2) To convert light energy into heat energy
3) To convert mechanical energy into electrical energy
4) To convert electrical energy into mechanical energy
Q. All of the following are examples of chemical changes except the -
1) magnetizing of iron
2) rusting of iron
3) digestion of food
4) souring of milk
Q. The isotopes of an element contain the same number of -
1) neutrons and protons
2) protons but different number of neutrons
3) neutrons and protons but different number f electrons
4) neutrons and electrons but different number of protons
Q. Pressure cooker cooks rice faster because -
1) it always lets the steam escape
2) high pressure crushes the hard covering of rice grains
3) it does not let the heat energy escape easily
4) high pressure raises the boiling point of water
Q. Which of the following is a physical change?
1) Oxidation
2) Reduction
3) Decomposition
4) Sublimation
Q. If the speed of rotation of the earth increases, the weight of the body -
1) increases
2) remains unchanged
3) decreases
4) may decrease or increase
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