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Physics (Objective) (Pages :44)
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121 The liquid used in Barometer?

Ans : Mercury
122 Sudden fall of mercury level in Barometer indicates?

Ans : Storm
123 Rising level of mercury in Barometer indicates?

Ans : Calm climate
124 Force of attraction between any two bodies in the universe is called?

Ans : Gravitation
125 Law of gravitation was discovered by?

Ans : Sir Isaac Newton
126 Weakest force in nature?

Ans : Gravitational Force
127 The force keeps the earth and other planetary objects in their orbits around the sun?

Ans : Gravitational Force
128 The acceleration with which the freely falling bodies are attracted towards the earth is called the?

Ans : Acceleration due to gravity (g)
129 Weight of freely falling body?

Ans : Zero
130 At the Center of earth Acceleration due to gravity (g) is?

Ans : zero
131 Acceleration due to gravity (g) is maximum at?

Ans : polar regions
132 Acceleration due to gravity (g) is minimum at?

Ans : Equatorial regions
133 Universal Law of Gravitation was put forward by?

Ans : Sir Isaac Newton
134 The 'g' is maximum on Jupiter and minimum on the planet?

Ans : Mercury
135 Astronaut cannot drink lemonade with the help of a straw because?

Ans : There is no atmosphere on the moon
136 Minimum speed which a body must have to escape from the earth's gravitational force is called?

Ans : Escape Velocity
137 Escape velocity of moon?

Ans : 2.4 km/s
138 Escape velocity of earth?

Ans : 11.2km/s
139 Escape velocity of planet Jupiter?

Ans : 60km/s
140 Escape velocity of planet Mercury?

Ans : 4.2km/s
141 Escape velocity of the planets increases with its?

Ans : Mass
142 Scientific study of light?

Ans : Optics
143 Light is an?

Ans : Electromagnetic Wave &. Transverse wave;
144 Light travels through air or vacuum at a speed of 3?

Ans : x 108m/s
145 Order of speed of light?

Ans : water < glass.< air < vacuum
146 Velocity of light is greater than the?

Ans : Sound
147 Light reaches earth from sun in?

Ans : 8 minutes 20semnds (500 seconds)
148 Substances which do not pass light through them are called?

Ans : Opaque substances eg : paper; storie
149 Substances which allow light to pass through them are called?

Ans : Transparent substances eg : glass
150 Wave theory of light was proposed by?

Ans : Christian Huygens

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