Introduction

Q. An ice cube feels cold in your hand because _____________.

1. your hand is an insulator
   
2. heat flows from the ice cube to your hand
3. cold flows from the ice cube to your hand
4. heat flows from your hand to the ice cube

Q. We are advised to avoid keeping a clinical thermometer in the sun or near a flame. Why?

Q. Which of the following is the part of an electric bulb that emits light?

1. Core
2. Filament
3. Metal base
4. Glass bulb

Q. During winter mornings why do people stand in the Sun? Explain.

Q. Which of the following statements is true for force?

1. Force can change the speed of an object.
2. Force can change the shape of an object.
3. Force can change the direction of an object.
4. All of these

Q.
Four containers with different colours have cold water at the same temperature. When kept outside on a sunny day, which container will heat faster?

1. Yellow
2. Black
3. Green
4. Red

Q. What do you mean by a vibratory motion?​

Q. Why do two thin blankets make us feel warmer than one thick blanket?

1. Wool is a good conductor of heat.
2. Air is trapped between the two thin blankets.
3. Heat from the surroundings does not reach us.
4. Thick blanket absorbs more heat.

Q.

I have a glass of water at room temperature, kept inside a closed room. I get a hot mug of coffee, keep it on another table, and get so busy I completely forget about it. As the coffee cools down, what happens to the temperature of the glass of water?

1. Stays absolutely unaffected, since it is on another table

2. The coffee cools down; the water also cools down with time

3. Cannot say from the given information

4. The water gets warmer

Q. Which of the following object(s) is/are hot with respect to a human body at room temperature?
(i)Base of a frying pan, right after cooking.
(ii) Ice cream.
(iii) Snow.
(iv) Molten wax.

1. i only

2. i, ii and iii

3. i and iv

4. iii and iv

Q.

1 hp = ___ watt

1. 74.6

2. 746

3. 7460

4. 764

Q. In which of the following case the bulb will not glow?

1. 
2. 
3. 
4. 

Q. One end of a metallic rod is dipped in ice whereas the other end in boiling water, as shown in the below given figure. Which of the following statements is correct regarding this arrangement?

1. Heat is being transferred from ice to boiling water by the mode of convection.
2. Heat is being transferred from boiling water to ice by the mode of conduction.
   
3. Heat is being transferred from boiling water to ice by the mode of convection
4. Heat is being transferred from ice to boiling water by the mode of conduction.
   

Q. Which of the following is not a unit of temperature?

1. Fahrenheit
2. Celsius
3. Metre
4. Kelvin

Q. Uneven heating between the equator and the poles sets up wind circulation from the poles to the warmer latitudes.

1. True
2. False

Q. We can trust our sense of touch to measure the degree of hotness of an object.

1. True
2. False

Q. The bulb in the circuit shown does not glow. Can you identify the problem? Suggest necessary changes in the circuit to make the bulb glow.

Q. What is zeroth law?

Q. Which of the following is not true about winds?

1. During wind formation, air moves from a low pressure region to a high pressure region.
2. Wind motion is due to differential heating on different places of the earth's surface.
3. Direction and speed are two important aspects of winds.
4. Wind's direction is influenced by the rotation of the earth

Q. A mould of clay changes its shape when we apply a force on it.

1. True
2. False

Q. With the increase in speed of wind, air pressure ___________.

1. remains same
2. first increases and then decreases
3. decreases
4. increases

Q.

I have a glass of water at room temperature, kept inside a closed room. I get a hot mug of coffee which is kept on another table. As the coffee cools down, what happens to the temperature of the glass of water?

1. The coffee cools down; the water also cools down with time

2. The water gets warmer

3. Cannot say from the given information

4. Stays absolutely unaffected, since it is on another table

Q. An ice cube feels cold in your hand because _____________.

1. your hand is an insulator
   
2. heat flows from the ice cube to your hand
3. cold flows from the ice cube to your hand
4. heat flows from your hand to the ice cube

Q. With the increase in speed of wind, air pressure ___________.

1. first increases and then decreases
2. remains same
3. decreases
4. increases

Q. If a force is applied on an object in the direction of its motion, speed of the object ___.

1. decreases
2. increases
3. doesn't change
4. first decreases, then increases

Q. Which of the following will make the bulb glow when joined in the circuit?

1. A
2. B
3. C
4. D

Q. The SI unit used to measure temperature is:

1. Fahrenheit
2. Celcius
3. Kelvin
4. Joule

Q. Mohan has three identical balloons X, Y and Z. Balloons X, Y and Z are filled with chilled air, air at room temperature and hot air respectively. Initially, the size of all the balloons were the same. What will be the correct order of size of balloons if they are kept for a long time at room temperature?

1. Y > Z > X
2. Z > X > Y
3. X > Y > Z
4. X = Y = Z

Q. The particles of gas become less energetic with the increase in temperature.

1. False
2. True

Q. The particles of gas become less energetic with the increase in temperature.

1. False
2. True