Physics - Study Mode
[#161] The motion of the wheels of a bullock-cart while moving on the road is an example of
Correct Answer
(C) Translatory and rotatory motion
Explanation
Solution: Rotatory motion is turning round in a circle, such as a wheel turning. While the wheel is moving, the mechanism transfers translatory motion into rotatory motion. As a matter of fact, translatory motion and rotatory motion occur at the same time.
[#162] As we go from Equator to North pole the value of ''g', the acceleration due to gravity
Correct Answer
(C) Increases
Explanation
Solution: As, the earth is not a perfect sphere, the gravity keeps on changing as we move from one place to another. But it is maximum at the place where it is nearer to the centre. So,Earth's gravity is the maximum at the poles because the Earth is kind of an ellipse (not a perfect sphere). And the equator is further away from the centre of mass of the Earth than at the poles. So, as we go from equator to poles, the value of g increases.
[#163] Speed in a given direction is called
Correct Answer
(A) Velocity
Explanation
Solution: The speed of an object in a particular direction is called velocity.
[#164] For a body moving with uniform acceleration its final velocity equals ________
Correct Answer
(B) 2 x average velocity - initial velocity
[#165] A car accelerates uniformly from 18 kmph to 72 kmph in 5 s. The acceleration of the car (in m/s 2 ) is:
Correct Answer
(A) 3
Explanation
Solution: Initial speed = u = 18 km/hr = 5 m/s Final speed = v = 72 km/hr = 20 m/s acceleration a = (v-u)/t = (20 - 5)/5 = 3 m/s 2 .