Physics-Objective Related Question Answers
126. Weakest force in nature?
Gravitational Force
127. The force keeps the earth and other planetary objects in their orbits around the sun?
Gravitational Force
128. The acceleration with which the freely falling bodies are attracted towards the earth is called the?
Acceleration due to gravity (g)
129. Weight of freely falling body?
Zero
130. At the Center of earth Acceleration due to gravity (g) is?
zero
131. Acceleration due to gravity (g) is maximum at?
polar regions
132. Acceleration due to gravity (g) is minimum at?
Equatorial regions
133. Universal Law of Gravitation was put forward by?
Sir Isaac Newton
134. The 'g' is maximum on Jupiter and minimum on the planet?
Mercury
135. Astronaut cannot drink lemonade with the help of a straw because?
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?
Escape Velocity
137. Escape velocity of moon?
2.4 km/s
138. Escape velocity of earth?
11.2km/s
139. Escape velocity of planet Jupiter?
60km/s
140. Escape velocity of planet Mercury?
4.2km/s
141. Escape velocity of the planets increases with its?
Mass
142. Scientific study of light?
Optics
143. Light is an?
Electromagnetic Wave &. Transverse wave;
144. Light travels through air or vacuum at a speed of 3?
x 108m/s
145. Order of speed of light?
water < glass.< air < vacuum
146. Velocity of light is greater than the?
Sound
147. Light reaches earth from sun in?
8 minutes 20semnds (500 seconds)
148. Substances which do not pass light through them are called?
Opaque substances eg : paper; storie
149. Substances which allow light to pass through them are called?
Transparent substances eg : glass
150. Wave theory of light was proposed by?
Christian Huygens
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