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The average molar heat capacity of ice and water are respectively 37.8 joule per mole and 75.6 joule per mole and the enthalpy of fusion of ice is 6.0 12 kilo joule per mole. the amount of heat required to change 10 gram of ice at -10 degree Celsius to water at 10 degree Celsius would be 1)2376J 2)4572J 3)3970J 4)1128J

Question 11 (i)

State whether the following statements are True/False.

Earthquakes occur anytime all over the world.

A boy having has a weight of 600 N on Earth. What would be his weight on the Moon? (g = 10 m/s²)

If $x,y,z\in R^{+}$ then $\frac{xy}{x+y}+\frac{yz}{y+z}+\frac{xz}{x+z}$ is always

The quantitative measure of inertia is _________.

Question 1 (iii)
Classify the following as motion along a straight line, circular or oscillatory motion:
(iii) Motion of a child in a merry-go-round.

Under what condition is the magnitude of average velocity of an object equal to its average speed?

Which of the following is correct about the law of reflection?

Matt has a magnet which is pointing in the North-South direction. He brings a large magnet which is not pointing in the North-South direction close to it. Can you tell what will happen to the first magnet?

A sound becomes irritating or unpleasant to hear, if its loudness exceeds _________.

Question 6

Two mirrors A and B are placed at right angles to each other as shown in the figure.









A ray of light incident on mirror A at an angle of ${25}^{\circ }$ falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be

(a) ${25}^{\circ }$

(b) ${50}^{\circ }$

(c) ${65}^{\circ }$

(d) ${100}^{\circ }$

What is the sequence of energy conversions takes place in hydro power plants?

Question 1 (c)
Fill the missing word in the blank spaces in the following statements:
(c) Near the earth’s surface $\underset{–}{}$ air rises up whereas $\underset{–}{}$ air comes down.

Which one of the following about the northern orientation of modern maps is asserted in the passage?

True or false?

(a) When heat is taken away from a substance it expands.

(b) The heat absorbed by a substance is not dependent upon its mass.

(c) The unit of specific heat is a °C.

(d) A bimetallic strip is used in an electric heater to keep the water temperature constant.

The phenomenon due to which the right of the object appears to be the left of the image is known as:

When two or more cells are joined together, they form a ___.

The princess was captured in the fort by a monster. The gate of the fort was locked by a code. The princess cried and sat down near the gate. There she saw a paper scroll in the bottle with some message on it.

Find the water image to help princess to escape?

If the time taken by the bob from O to B is T , then what will be the time taken by the bob to go from A to B?
Assume O to be the mean position and A and B are the extreme positions on either end.

A big rubik's cube is made whose dimension is $20\times 20\times 20$. Find the diffrence in volume of the bigger one and a smaller one whose dimension is $19\times 19\times 19$. [2 MARKS]

I cant understand the formula of calculating weight i.e weight =m*g.what is m and g. Why are rest and motion relative terms.

Question 8 (d)
The safety device based on the heating effect of electric current is called a ___.

A plastic ball is rolled along a horizontal surface. The ball comes to stop after some time. Which force is responsible for stopping the motion of the ball?

In 1 minute, how much energy does a $100W$ electric bulb consumes?

Name the scientist who performed experiments to show that white light is made up seven colours.

Symbol of a battery is:

I still have a doubt in classification of why do we need meteorologists while writing answer in 80 to 100 words.