Explore topic-wise InterviewSolutions in .

A man weighs 600 N on the equator, but when he moves to the pole he finds a slight increase in his weight. This is because:

How does the liquid pressure on a diver change if :
(i) the diver moves to the greater depth, and
(ii) the diver moves horizontally ?

What do you observe when force is applied and removed from the plunger of the syringe containing air. Explain briefly

An ant moves from one corner of a hall to the diagonally opposite corner. If the dimension of the hall are 8 m x 6 m, the displacement of the ant is :

What is meant by zero error of a vernier callipers ? How is it determined ? Draw neat diagrams to explain it. How is it taken in account to get the correct measurement ?

1. 22.4

(a) Derive the formula: $s=ut+\frac{1}{2}a{t}^2$, where the symbols have usual meanings.

(b) A train starting from stationary position and moving with uniform acceleration attains a speed of 36 km per hour in 10 minutes. Find its acceleration.

When a large bubble rises from the bottom of a lake to the surface. Its radius doubles. If atmospheric pressure is equal to that of column of water height H, then the depth of lake is

The equations of motion can be derived by using:

Choose the correct option according to the angle between force and direction of displacement.

$$\begin{array}{cc}\text{Coloumn1}& \text{Coloumn2}\\ 1.\theta \text{is zero}& i)\text{Work done is always zero}\\ 2.\theta \text{is less than}{90}^0& ii)\text{Work done is non-negative}\\ 3.\theta \text{is greater than}{90}^0& iii)\text{Work done is always positive}\\ 4.\theta \text{is}{90}^0& iv)\text{Work done is never positive}\end{array}$$

A vessel contains oil (density = 0.8 gm / $c{m}^3$) Over mercury (density = 13.6 gm / $c{m}^3$). homogeneous sphere floats with half of its volume immersed in mercury and the other half in oil. The density of the material of the sphere in gm/$c{m}^3$

A can of coke has three holes as shown in the figure. If coke is completely filled into the can and all the three holes are opened, then which of the following figure correctly describes the outflow of coke?

A ball is projected vertically upwards with an initial velocity of "u" goes to a maximum height "h" before coming to the ground. What is the value of h?

Explain the following:

(a) The telephone wires break in winter.

(b) Iron rims are heated before they are fixed on the wooden wheels.

(c) The gaps are left between the successive rails on a railway track.

(d) A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle.

(e) A cement floor is laid in small pieces with gaps in between.

Choose the incorrect statement from the following regarding magnetic lines of force.

What force acting on an area of 0.5 m2 will produce a pressure of 500 Pa ?

An object is placed 36 cm from a convex lens. A real image is formed 24 cm from the lens. Calculate the focal length of the lens. [2 MARKS]

A, B and C are three balloons ascending with velocities U, 3U and 9U respectively. If stones of the same mass are dropped from each, when all the three balloons are at the same height, then

The pressure exerted on a surface depends on?

A block of mass 5 kg is sliding on a smooth floor with a velocity of 20 $m{s}^{-1}$. The amount of work done is_______ and _______.

A sound wave is a sequence of __ and rarefactions.

If the number of turns in the armature coil is doubled, the speed of rotation of the armature coil ___.

A fruit is dropped from a height of 20 m. Find the velocity with which it would hit the ground. Take g = $10m{s}^{-2}$

If action and reaction are equal and opposite forces, then how can anything ever be accelerated?

An object has moved through the distance . can it have zero displacement? If 'yes' support your answer with an example ?

Write the full name of 'SONAR'.

The given figure shows acceleration – time graph for a rectilinear motion. Find average acceleration in first 10 seconds.

Which of the following is/are the main type/s of economic activities?

What is the speed of car in point of view of astronaut.( Car is driving at a constant n moderate speed)

A.it is more than the speed of earth

B.it is less than the speed of earth

C.same moderate speed

A column of air extending up to the height of atmosphere and base of area 10 cm $\times$ 10 cm was kept above a boy's head. Why didn't he get crushed?

The relative density of silver is 10.8. The density of water is $1000\frac{kg}{m^3}$. The density of silver is:

Explain the working of the hearing aid. [3 MARKS]

Which requires more work( in Joule) a block of 20 kg need to lift 20m or a block of 40 kg need to lift 10m.

A box of mass 4.3 kg is lifted diagonally from point A to point B as shown in the given figure. Given that the acceleration due to gravity is 10 $m{s}^{-2}$, then the gravitational potential energy gained by the box will be ________.

If an atom A has mass number 'x' and atomic number 'y' ( ${}_y{A}^x$ ) and it forms an ion by losing an electron. What can we say about the mass number of the ion?

The time period of a pendulum clock is :

(a) 1 s (b) 2 s

(c) 1 min (d) 12 h

The speed of the body in the time interval 14 to 18 seconds is

The following time-velocity graph (fig.) represents

A rifle of mass $5kg$ fires a bullet of mass $40g$. The bullet leaves the barrel of the rifle with a velocity $200m{s}^{-1}$. If the bullet takes $0.004s$ to move through the barrel, calculate the recoil velocity of the rifle.