181. The unit of power is-

1. Hertz
2. Volts
3. Watt
4. Neutrons

Option “3” is correct.
In the field of Physics watt is measurement of power, describing the rate at which electricity is being used at a specific moment.
The S.I. unit of power is watt, which is equal to joule per second.
182. The sun and the moon appear elliptical near the horizon because of :

1. Refraction
2. Optical illusion
3. Interference phenomenon
4. Their actual shape

Option “1” is correct.
The Sun and the moon appear elliptical near the horizon because of refraction.
183. Static science is associated with-

1. Dynamic situation
2. Situation of rest
3. Mental situation
4. Data analyzing

Option “2” is correct.
Statics is a branch of mechanics associated with the situation or rest.
184. The colour of the star is an indication of its:

1. Distance from the earth
2. Temperature
3. Luminosity
4. Distance from the sun

Option “2” is correct.
The colour of the stars reflects the age of stars. Colour is reflected from the temperature is high, then the star is young. The star will be blue during young stage which indicates high temperature. If star is red the temperature is low.
185. Power of sunglass is-

1. 0 Dioptre
2. 1 Dioptre
3. 2 Dioptre
4. 4 Dioptre

Option “1” is correct.
The power of the sunglass is 0 dioptre.
186. Who invented Rocket?

1. Rich K Goyle
2. E M Forster
3. Robert Goddard
4. James Anderson

Option “3” is correct.
Robert Hutchings Goddard (October 5, 1882 – August 10, 1945) was an American engineer, professor, physicist, and inventor who is credited with creating and building the world’s first liquid-fueled rocket.
187. The remove the defect of long sightedness one uses-

1. Concave lens
2. Convex mirror
3. Convex lens
4. Concave mirror

Option “3” is correct.
Farsightedness (Hypermetropia) as it is medically termed is a vision condition in which distant object are usually seen clearly, but close ones do not come into proper focus. To remove this vision problem one should use a convex lens.
188. An air bubble in water will act like a:

1. Convex mirror
2. Convex lens
3. Concave mirror
4. Concave lens

Option “4” is correct.
Air is optically rarer than water, the ray of light bends away from the normal at the point of incidence when moving from water to air while it bends towards the normal while moving from air to water. It is clearly visible that the air bubble acts as a DIVERGING LENS (concave lens) in water.
189.Match the following

1. a
2. b
3. c
4. d
 
Option “4” is correct.
The correctly matched options is given below:
John Guttenberg – Printing Press
John Roentgen – X-ray
Michael Faraday – Dynamo
Alexander Graham Bell – telephone
190. With reference to gravity, what is G called?

1. Gravitational constant
2. Gravitational attraction
3. Gravitational force
4. Acceleration due to gravity

Option “1” is correct.
The gravitational constant, symbolized G , is a physical constant that appears in the equation for Newton’s law of gravitation.This is different from ‘g’ which is denotes the acceleration due to gravity.
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