Heat

Q.

Discuss any three problems caused by indiscriminate use of natural resources.

Q.

What is the SI unit of specific heat capacity?

Q.

Write 15 slogans on save trees.

Q. Which of the following is not enviromentally friendly?

1. Reforestation
2. Burying plastic waste
3. Segregated waste disposal
4. Biodegradable utilities

Q.

State three differences between heat and temperature.

Q.

What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited applications?

Q. Which of the following is not environment friendly?

1. Reforestation
2. Burying plastic waste
3. Segregated waste disposal
4. Biodegradable utilities

Q.

One calorie is the heat energy required to raise the temperature of 1 g of water from _________.

1. ${10}^{\circ }C$ to ${100}^{\circ }C$

2. $1^{\circ }C$ to ${10}^{\circ }C$

3. ${14.5}^{\circ }C$ to ${15.5}^{\circ }C$

4. any initial to any final temperature

Q.

Marching of soldiers in a parade is an example of a ___.

1. rectilinear motion

2. rotational motion

3. circular motion

4. random motion

Q.

Which of following is the fastest means of transportation?

1. Roadways

2. Airways

3. Waterways

4. Railways

Q.

Solar cell is a device which converts light energy into electrical energy.

1. True
2. False

Q.

Give the CGS unit of heat.

Q. ____ is the comparison of an unknown quantity with a known quantity.

1. Motion
2. Complementary ratios
3. Multiplication
4. Measurement

Q. What are the methods used to increase the boiling point of water in pressure cooker and in the radiator of vehicles

Q.

The temperature at which molecular motion ceases is ___ K.

Q.

What are 3 Rs to save the environment?

Q.

Which of the following is not a mode of transport?

1. Ship

2. Chair

3. Car

4. Train

Q.

Name the physical quantity which is measured in calorie.How is it related to the S.I. unit of that quantity?

Q.

Define the term heat.

Q. Specific heat capacity is the amount of heat required to raise the temperature of unit mass of a substance by $1^{\circ }C$.

1. False
2. True

Q. The total energy of the system is called ___ of the system.

Q. Heat energy flows from one body to another if there is a difference in ___ of two bodies.

1. mass
2. volume
3. temperature
4. height

Q.

The minimum amount of heat energy required to emit an electron from a metal surface is called

1. Thermionic Work Function or Threshold Energy

2. Ionisation Potential or Threshold Energy

3. Ionisation Energy or Threshold Energy

4. Photoelectric Work function

Q. Which mode of transportation was used by early man?

1. Animal drawn vehicles
2. Steam engine
3. Spacecraft
4. Motor boat

Q. How much amount of heat required to raise 1 degree celsius to unit mass of substance ?Express in S.I and C.G.S systems.

Q.

What are the role of a plane mirror and a glass sheet in a solar cooker?

Q.

Why bio-gas is also termed as gobar gas?

1. Gobar gas is a gas which is produced from biomass hence, the name.

2. Gobar is the major constituent of the slurry which is used in the production of bio-gas.

3. Bio-gas can be produced only by gobar.

4. Gobar constitutes 99% of the bio-gas.

Q.

________is a mixture of molten or semi-molten rock, volatiles and solids that is found beneath the surface of the Earth.

1. magma

2. core

3. lava

4. geyser

Q. Which of the following exhibits rotatory motion but not translatory motion?

1. A drill that bores a piece of wood
2. A spinning fan
3. The rear wheel of a moving bicycle
4. A ball delivered by spin bowler

Q. In a circular motion, the distance between the moving particle and the fixed point about which it rotates _______ with time.

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