Physics One-liner 3: SSC CGL CHSL MTS Free Study Materials PDF

81) What does the rusting of iron nail?

Increases its weight

82) Which is useful in the detection of landmines?

Wasp

83) Which instrument used to measure the force and velocity of the wind?

Anemometer

84) What is most suitable for the core of an electromagnet?

Soft iron

85) A convex mirror makes a good rear-view mirror for a car. Why?

It forms erect, reduced images

86) For the measurement of temperature of the order of 400°C, what will we prefer?

Thermocouple

87) If the current in the core decreases, what will the strength of the magnetic field be?

Decreases

88) What is the commonly used unit for measuring the speed of data transmission?

Bits per second

89) The change in temperature of a body is 50°C. What is the change on Kelvin scale?

50 K

90) What is the amount of actual water vapour of air?

Absolute humidity

91) How is Missile ‘Astra’?

A air to air missile

92) What is Electric field intensity at a point a hollow charged spherical conductor?

Is zero

93) With which instrument can a sailor in a submarine see the objects on the surface of sea?

Periscope

94) At absolute zero temperature, what will be the kinetic energy of the molecules?

Zero

95) Which is the instrument that measures air pressure?

Barometer

96) By whom was the quantum theory first enunciated?

By Max Planck

97) If a proton of mass m is moving with velocity of light, how will its mass?

Infinite

98) What is the working principle of Rocket?

Newton’s 3rd Law

99) Rice is cooked more quickly in a pressure cooker because?

water boils at Higher temperature.

100) Why the raindrops acquired the spherical shape?

Surface tension

101) A fountain pen works on the principle of Capillary action

102) Cooking of Rice is Harder?

Top of the mountains

103) Best Liquid for the Transformer core is?

Soft Iron

104) What is the permissible level of noise in a silent zone at daytime?

75 dB)

105) By which force can fat be separated from milk in a cream separator?

Centrifugal force

106) How do fogs formed along the seacoast?

Due to advection

107) Who is associated with the development of India’s Atomic Bomb?

Raja Ramanna

108) Which is the unit of activity of a radioactive source?

Becquerel

109) By which fission does Leishmania, the causative agent of kala-azar, multiply asexually?

By binary fission

110) When a ray of light is going from one medium to another, how is its frequency changes?

Frequency remains same

111) Heat given to an ideal gas under isothermal conditions is used in which work?

In doing external work

112) How many images can a man see if a man stands between two plane mirrors inclined at an angle of 60°?

5

113) Why can Insects move on the surface of water without sinking?

Due to Surface tension of water

114) The intensity of a magnetic field is defined as the force experienced by which pole?

Unit north pole

115) Fluorescent tubes are fitted with a choke. What does the choke coil?

Reduces current in the Circuit

116) The focal length of a convex lens is 50 cm. What is its power?

+2 D

117) Electrostatic Precipitator is used to control the?

Air Pollution

118) Atomic clock transitions depend upon the?

Caesium

119) What is the working principle of periscope?

Laws of Reflection

120) Total internal reflection cannot occur, when light?

From water to glass