Hot and Cold Objects

Q. Which of the following denotes the smallest temperature?​

1. 1${}^o$ on Fahrenheit scale​
2. 1${}^o$ on Kelvin scale​
3. 1${}^o$ on Celsius scale​

Q. Conduction of heat cannot take place in

1. 
   solids
2. 
   gases
3. 
   liquids
4. 
   vacuum

Q.

Name the plant used to make bristles of brushes.

Q. In the below experiment, wax is used to attach drawing pins to the rods of different materials. All the rods are in contact with the boiling water. Which of the following pins is going to fall first?

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

Q. What are conductors and insulators of heat?Give examples [3 MARKS]

Q. Which of the following is a bad conductor of heat?

1. Steel
2. Copper
3. Ceramic
4. Iron

Q.

Conduction cannot happen in vacuum.

1. True
2. False

Q. Anuradha made some noodles, and she wants them to cool down quickly. She should put them on a plate made of _______.

1. plastic
2. glass
3. steel
4. wood

Q. What is the one word common to all the images given below?

1. 
2. 
3. 
4. 

Q. The molecules in a hot body are less active than those in a cold body.

1. False
2. True

Q. Which of the following object is hot?

1. Snow
2. Burning coal
3. Ice-cream
4. Cold coffee

Q.

Our sense of touch is reliable to measure hotness or coldness of a body.

1. True

2. False

Q. Which of the following are the units for measuring temperature?

1. Kelvin
2. Joule
3. Calorie
4. Celsius

Q. Which of the following object(s) is/are hot at room temperature?

1. Ice cream
2. Snow
3. Molten wax
4. Boiling water
5. Burning coal

6. Hot iron

7. Chilled coffee
8. Steam

Q.

Hotness of a body is relative.

1. False

2. True

Q.

Himanshu has three buckets as shown below. He puts his right-hand in bucket A and left-hand in bucket B. He then puts both his hands in normal water. His right-hand feels that the water here is hotter while his left-hand feels that the water here is colder.

What can be said about the hotness of water in bucket A and B?

1. Water in bucket A is hotter than that in bucket B.
2. Water in bucket B is hotter than that in bucket A.
3. Water in buckets A and B is equally hot.
4. Can’t be predicted

Q. ____ is the device used to measure temperature.

1. Manometer
2. Thermometer
3. Ammeter
4. Stethoscope

Q. Mercury when temperature decreases and when temperature increases.

1. expands
2. flows
3. remains still
4. contracts