General Science Quiz -7 (Physics)
Q1: Desalination of seawater is done by using reverse osmosis.
The pressure applied to the solution is
(a) larger than the osmotic pressure
(b) smaller than the osmotic pressure
(c) equal to osmotic pressure
(d) equal to atmospheric pressure
Q2: The unit of power is
(a) Hertz
(b) Volts
(c) Watt
(d) Neutrons
Q3: Which one of the following dements is used as a timekeeper in atomic clocks?
(a) Potassium
(b) Caesium
(c) Calcium
(d) Magnesium
Q4: Which one of the instruments is used for locating submerged objects in an ocean?
(a) Audiometer
(b) Galvanometer
(c) Sextant
(d) SONAR
Q5: Why is argon gas used along with tungsten wire in an electric bulb?
(a) To increase the life of the bulb
(b) To reduce the consumption of electricity
(c) To make the emitted light coloured
(d) To reduce the cost of the bulb
Q6: As the train starts moving, the head of the passenger sitting inside leans backwards because of
(a) Inertia of Rest
(b) Inertia of Motion
(c) Moment of Inertia
(d) Conservation of Mass
Q7: When a piece of pure silver is doped with aluminium, then
(a) the conductivity of the doped silicon piece will remain the same
(b) the doped silicon piece will become n-type
(c) the doped silicon piece will become p-type
(d) the resistivity of the doped silicon piece will increase
Q8: An iron needle floats on the surface of water due to
(a) Upthrust of water
(b) Surface tension
(c) Viscosity
(d) Gravitational force
Q9: The reason for the mirage is
(a) Interference of light
(b) Diffraction of light
(c) Polarisation of light
(d) Total internal reflection of light
Q10: Which one of the following is not a semiconductor?
(a) Silicon
(b) Germanium
(c) Quartz
(d) Gallium arsenide
Q11: For which one of the following does the centre of mass lie outside the body?
(a) A fountain pen
(b) A cricket ball
(c) A ring
(d) A book
Answer:
1: (a) larger than the osmotic pressure
2: (c) Watt
3: (b) Caesium
4: (d) SONAR
5: (a) To increase the life of the bulb
6: (a) Inertia of Rest
7: (c) the doped silicon piece will become p-type
8: (b) Surface tension
9: (d) Total internal reflection of light
10: (c) Quartz (It is an insulator)
11: (c) A ring (Centre of mass of ring is at its centre which is outside its body)
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