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31 questions
21
Mechanics
Moderate
+1.0
-0.25
Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling. Reason (R): If no external force acts on a system, its momentum cannot change. Code:
22
Mechanics
Moderate
+1.0
-0.25
It is difficult to walk on ice than on the road because :
23
Mechanics
Moderate
+1.0
-0.25
A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to :
24
Mechanics
Moderate
+1.0
-0.25
For every action there is an equal and opposite reaction. The law was given by :
25
Mechanics
Moderate
+1.0
-0.25
Cycle and cars used ball bearing, because-
26
Mechanics
Moderate
+1.0
-0.25
Ball bearings are used to convert static friction into :
27
Mechanics
Moderate
+1.0
-0.25
An oil tanker is partially filled with oil and moves forward on a level road with uniform acceleration. The free surface of oil then —
28
Mechanics
Moderate
+1.0
-0.25
What is the correct equation for finding the acceleration?
29
Mechanics
Moderate
+1.0
-0.25
The working principle of a washing machine is :
30
Mechanics
Moderate
+1.0
-0.25
The separation of cream from milk by churning is due to