If M is the mass ofthe earth and R its radius, the ratio of the gravitational acceleration and the gravitational constant is
MR2
A student unable to answer a question on Newton's laws of motion attempts to pull himself up by tugging on his hair. He will not succeed
as the force exerted is small
the frictional force while gripping, is small
Newton's law of inertia is not applicable to living beings
as the force applied is internal to the system
Three long, straight parallel wires, carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is
5.2 × 103 N
2.5 × 10-3 N
zero
1.5 × 10-3 N
A 5.0 amp current is setup in an external circuit by a 6.0 volt storage battery for 6.0 minutes. The chemical energy of the battery is reduced by
1.08 × 104 J
108 × 104 J
1.8 × 104 J
18 × 104 J
The adjacent figure is the part of a horizontally stretched net. Section AB is stretched with a force of 10 N. The tensions in the sections BC and BF are
10 N, 11 N
10 N, 6 N
10 N, 10 N
can't be calculated due to insufficient data
Out of the following four dimensional quantities, which one qualifies to be called a dimensional constant ?
Acceleration due to gravity
Surface tension of water
Weight of a standard kilogram mass
The velocity of light in vacuum
The relationship between the force F and position x of a body is as shown in figure. The work done in displacing the body from x = 1 m to x = 5 m will be
30 J
15 J
25 J
20 J
From the top of a tower of two stones, whose masses are in the ratio 1 : 2 are thrown on straight up with an initial speed u and the second straight down with the same speed u. Then neglecting air resistance
the heavier stone hits the ground with a higher speed
the lighter stone hits the ground with a higher speed
both the stones will have the same speed when they hit the ground
the speed can't be determined with the gven data
From the adjacent figure, the correct observation is
the pressure on the bottom of tank A is greater than at the bottom of B
the pressure on the bottom of the tank A is smaller than at the bottom of B
the pressure depends on the shape of the container
the pressure on the bottom of A and B is the same
D.
the pressure on the bottom of A and B is the same
Pressure applied by liquid column
P = hdg
i.e, the pressure depends on the height of liquid column not on its size, so pressure at the bottom of A and B is same.