The rotational effect of a force on a body about an axis of rotation is described in terms of
Centre of gravity
Centripetal force
Centrifugal force
Moment of force
Answer: Option D
Similar Questions :
1. The rotational effect of a force on a body about an axis of rotation is described in terms of
Centre of gravity
Centripetal force
Centrifugal force
Moment of force
Answer: Option D
2. Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings."
Doppler's Effect
Newton's law of cooling
Kirchhoff's Law
Stefan's Law
Answer: Option B
Explanation:
Doppler's Effect - The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding.
Kirchhoff's Law - Kirchhoff's Law signifies that good absorbers are good emitters.
Stefan's Law - The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
3. The incident ray, reflected ray and normal to the reflecting surface at the incident point all never lie in same plane.
True
False
Answer: Option B
4. The angle of reflection is equal to the angle of incidence.
True
False
Answer: Option A
5. Which instrument is used to determine the intensity of colours ?
Cathetometer
Chronometer
Colorimeter
Commutator
Answer: Option C
Explanation:
Cathetometer - is used to determine heights,
Chronometer - is used to longitude of a vessel at sea,