Physics Page-11

101) Through which of the following media does sound travel the fastest?
(A) Cool air
(B) Warm air
(C) Cold water
(D) Steel

102) Which of the following instruments is used for detecting and measuring small electric currents?
(A) Ammeter
(B) Fluxmeter
(C) Galvanometer
(D) Voltmeter

103) The lightning conductor or rod used for protecting buildings from lightning is made of
(A) Aluminium
(B) Copper
(C) Iron
(D) All of the above

104) What is the melting point of Tungsten?
(A) 500°C
(B) 2,000°C
(C) 1,000°C
(D) 3,000°C

105) Colours seen on oil films spread on water are seen because of
(A) Interference of light waves
(B) Refraction of light
(C) Reflection of light
(D) None of the above

106) A motorcar is moving with uniform velocity on a rough horizontal road. According to Newton's law of motion
(A) The kinetic energy of the car is increasing
(B) There is no unbalanced force acting on the car
(C) Forces are acting on the car
(D) The car is being accelerated

107) If a bimetallic strip is heated, it will
(A) Twist itself into a helix
(B) Not bend at all
(C) Bend towards the metal with higher thermal coefficient of expansion
(D) Bend towards the metal with the lower thermal expansion coefficient

108) In an electronic watch, the component corresponding to the pendulum of a pendulum clock is
(A) Transistor
(B) Balance wheel
(C) Crystal oscillator
(D) Diode

109) Why is the light of ordinary lamp hotter than the tube light
(A) It is due b incandescence
(B) It is due to ionization of gases
(C) It has more surface for distribution of energy
(D) It gives white light

110) The resistance of a bulb rated 60 watts/220 volts is approximately
(A) 4 Ω
(B) 40 Ω
(C) 400 Ω
(D) 800 Ω

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