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Which of the following sites has/have been selected for exploitation of geo-thermal energy?

(1) Badrinath-Tapovan (2) Surajkund

(3) Manikaran (4) Puga

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What will happen if the string to which the stone is tied is suddenly snapped? Justify
your answer from both ground‟s and stone‟s frame of reference. To explain, you can also take the
case of the Earth when Sun suddenly vanishes.

Current from a battery is flowing through a straight conductor. Which rule helps to understand the direction of the magnetic field around the conductor.

Electric field at the surface of charged conductor is

The meniscus of mercury in the capillary tube is

Use Newton's second law of motion to explain the following:
(a) A cricketer pulls his hands back while catching a fast moving cricket ball.
(b) An athlete prefers to land on sand instead of hard floor while taking a high jump.

State the functions of decomposers in an ecosystem.

What is the difference between runs scored by batsmen '3' and '5'?

If the momentum of the body reduces n times its kinetic energy reduces by

When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.

What is the shape of a soundboard kept behind the speaker on the stage of a big hall ?

The energy conversion in an electric motor is

Among these two scenarios, identify the action force and reaction force.

Scenario 1$:$ A person is pushing a book on the table.

Scenario 2$:$ A gun is fired

Then match the following.

$$\begin{array}{cc}coloumn-A& coloumn-B\\ 1.Actionforce& a)forceappliedbythebookontheboy\\ 2.Reactionforce& b)forceappliedbytheboyonthebook\\ & c)recoilforceonthegun\\ & d)acceleratingforceonthebullet\end{array}$$

A force of 5N gives a mass m₁ an acceleration of 8 m/s^{​​​​​​2} ,and a mass $m_2$ an acceleration of 24 $m/s{}^2$​​​​​. What acceleration would it give if both the masse's are tied together.

Please explain step by step.

Which of the following action are in free fall?

1. An object dropped from a certain height.

2. An object is thrown upward or a person jumping off.

3. Flying in a aircraft.

4. A car accelerating at 9.8 $\frac{m}{s^2}$ in the road.

What is the acceleration of a body moving with uniform velocity?

Define temperature and write its S.I.unit.

Action and reaction always

How is work related to energy ?

We shift a body in equilibrium from A to C in a gravitational field via path AC and ABC. Mark the correct option.

Equal masses of water and a liquid of relative density 2 are mixed together. Then, the mixture has a relative density of:

Use the following information to answer the next question.

A pencil is placed in front of a concave mirror at any distance (as shown in the given figure).

The image of the pencil formed by the mirror cannot be

The position-time (x-t) graphs for two children A and B returning from their school O to their homes P and Q respectively are shown in Fig. 3.19. Choose the correct entries in the brackets below;
a) (A/B) lives closer to the school than (B/A)
b) (A/B) starts from the school earlier than (B/A)
c) (A/B) walks faster than (B/A)
d) A and B reach home at the (same/different) time
e) (A/B) overtakes (B/A) on the road (once/twice).

Tinku dropped a stone into a very deep well. He hears the sound 6.53 s after he had dropped the stone. Find the depth of the well. Take acceleration due to gravity, g = 10m/s^{​​​​​​2} and Vsound as 340 m/s

Rajan exerts a force of 150 N in pulling a cart at a constant speed of 10 m $s^{-1}$.Calculate the power exerted.

How much energy is gained by a box of mass 20 kg when a man

(a) carrying the box waits for 5 minutes for a bus?

(b) runs carrying the box with a speed of 3 m $s^{-1}$ to catch the bus?

(c) raises the box by 0.5 m in order to place it inside the bus?(g=10 m $s^{-2}$).

We should drink 10 glasses of water in a day to stay fit. If one glass contains 210 ml of water, then we should drink _____ l to stay fit.

The value of g on the moon is g = GM/R2 where

Is gravity present in vaccum?

Draw the sketches of two waves A and B such that wave A has twice the wavelength and half the amplitude of wave B.

The device which converts mechanical energy into energy which runs out microwave oven is :

(a) electric motor

(b) alternator

(c) turbine

(d) electric heater

Write the expression for work done by a force.

When we change a feeble sound to a loud sound, we increase its :

(a) frequency

(b) amplitude

(c) velocity

(d) wavelength

Gravitational force is proportional to the product of the_____ and inversely proportional to the square of _____ between two bodies.

The given figure shows the distance-time graph of three cars $A$, $B$ and $C$. Study the graph and answer the following question:

How far has car $B$ travelled by the time it crosses car $C$?

Explain the mechanism of attraction of iron nails by a magnet when brought near them.

What are the differences between speed and velocity?

Explain what do you understand by magnetic induction. What role does it play in attraction of a piece of iron by a magnet ?

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

What is the unit of acceleration due to gravity ?

Which of the following statements is correct?

Statement 1: Mass of a body is defined as the quantity of matter contained in it.
Statement 2: Mass of a body remains constant and does not change from place to place.
Statement 3: Mass of a body cannot be zero.
Statement 4: S.I unit of mass is kg.

Choose the incorrect statement from the following regarding magnetic lines of the field:

If a $1200W$ electric iron is used daily for $30$ minutes, calculate the electricity consumed for the month of june.

If a bar magnet is placed on a plastic plate with pins spread on it, then________.

Two paths lead to the top of a hill. The first path is short and steep. The second path is longer and steeper. The gain in potential energy is more for which path?

An electric bulb is rated $220V$ and $100W.$ When it is operated at $110V,$ the power consumed will be

Two resistors of resistances 4Ω each are connected in parallel. Find the equivalent resistance of the circuit.