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A train covers 50 km with the speed of 100 km per hour and another 50 km with a speed of 50 km per hour. Find the average velocity.

Arrange the following speeds in increasing order:

10 m $s^{-1}$,1 km $mi{n}^{-1}$,18 km $h^{-1}$.

A cricket ball of mass 100 g moving at a speed of 30 $m{s}^{-1}$ is brought to rest by a player in 0.03 s. Find the average force applied by the player.

Why we should take equation to find the work done we can take other equation ?

What is the realation between small g and capital G

The Hubble Space Telescope was launched by the NASA in , and Chandra was launched in .

The speed-time graph for a particle moving at constant speed is a straight-line ________ to the time axis.

State whether the following statements are true or false :
(a) A falling stone also attracts the earth.
(b) The force of gravitation between two objects depends on the nature of medium between them.
(c) The value of G on the moon is about one-sixth $\left(\frac{1}{6}\right)$ of the value of G on the earth.
(d) The acceleration due to gravity acting on a freely ailing body is directly proportional to the mass body.
(e) The weight of an object on the earth is about one-sixth of its weight on the moon.

A ball is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy when its reaches the maximum height?

The pitch of the sound is determined by:

In a DC motor, the device which is used to change the direction of current through the coil after every half rotation is called

A screw gauge has 50 divisions on its circular scale and its screw moves by 1 mm on turning it by two rotations. When the flat end of the screw is in contact with the stud, the zero of circular scale lies below the base line and 4th division of circular scale is in line with the base line. Find : (i) the pitch, (ii) the least count and (iii) the zero error, of the screw gauge.

The SI unit of power is

The apparatus used for the determination of surface tension of a liquid is

An object weighs 10N in air. When immersed fully in a liquid, it weighs only 8N.The weight of a liquid displaced by object will be:

The pressure inside a liquid of density $\rho$ at a depth h is :
(a) $h\rho g$ (b) $\frac{h}{\rho g}$
(c) $\frac{h\rho }{g}$ (d) $h\rho$

Question 4 (b)
How can three resistors of resistances 2 Ω, 3 Ω and 6 Ω be connected to give a total resistance of
(b) 1 $\Omega$ ?

In the relation $F=G\times M\times m/d^2$, the quantity G:
(a) depends on the value of g at the place of observation
(b) is used only when the earth is one of the two masses
(c) is the greatest on the surface of the earth
(d) is of the same value irrespective of the place of observation

The minimum distance between the source and the reflector in air, to hear an echo, is approximately :

(a) 10 m (b) 17 m

(c) 34 m (d) 50 m.

State two uses of a plane mirror.

State Archimedes' principle.

The initial velocity of a particle is u (at t=0) and the acceleration f is given by $f=at$ where $a$ is a constant. Which of the following relation is valid?

Describe the procedure to measure the diameter of a wire with the help of a screw gauge.

Name two units of length which are bigger than a metre. How are they related to the metre ?

Which of the following correctly represents the order of trophic levels?

A force of 5 Newton making an angle x with the horizontal acting on an object is displaced by 0.4m along the horizontal direction if the object gains kinetic energy of 1J the horizontal component of the force is...

The device which uses ultrasonic waves to measure the distance, direction and speed of underwater objects is __ .

Which of the following energies do water stored in a dam and the water flowing from it contain?

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 :

A body 'A' transferred 10 J of heat energy to a body 'B', which got completely converted to the kinetic energy and 'B' started moving with a velocity, v. What is the value of v? (mass of A: 100 g, the mass of B = 200 g)

The position of a particle is given by x = at³ where a is a constant. Find the velocity as a function of time.

Ocean tides are the result of:

Suppose the gravitational force varies inversely as the $n^{th}$ power of distance. Then the time period of a planet in circular orbit of radius R around the sun will be proportional to

Name the energy transfer which occurs when :

(a) an electric bell rings

(b) someone speaks into a microphone

(c) there is a picture on a television screen

(d) a torch is on

A car having a mass of 1000 kg and kinetic energy of 129600 J. The driver applies the brake when he suddenly sees an obstacle. The car comes to a halt after travelling 100 m distance without meeting an accident. Calculate the frictional force.

Hydrostatic pressure in water varies significantly over small change in depth whereas the atmospheric pressure does not change unless the difference in altitude is very large?why?

If $V$ is the voltage across the conductor, $I$ is the current through a conductor and $R$ is the resistance of the conductor at a constant temperature $T$. Which of the following depicts the mathematical form of Ohm’s law?

On what factor/factors does the weight of a body depend ?

Two bodies A and B having mass 2 kg and 4 kg respectively, are separated by 2 meters. Where should a body of mass 1 kg be placed so that the gravitational force in this body due to bodies A and B is zero

A body's weight 75g in air 70.5g in water and 66g in a liquid . Calculate the R.D of the liquid.

Your Results For

Am i right in saying that heat, being energy transferred due to thermal interaction, heating is the process of transferring of this heat energy from one system to another system?