GITARATTAN JINDAL PUBLIC SCHOOL
ROHINI DELHI-110085
QUESTION BANK
CLASS
: VII
SUBJECT : SCIENCE
TEMPERATURE AND HEAT
MULTIPLE CHOICE QUESTION ( 1 MARKS EACH)
1.A wooden spoon is dipped in a cup of ice cream. Its other end
(a) becomes cold by the process of conduction (b) becomes cold by the process of convection.
(c) becomes cold by the process of radiation. (d) does not become cold.
2. An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will
(a) flow from iron ball to water. (b) not flow from iron ball to water or from water to iron
ball.
(c) flow from water to iron ball. (d) increase the temperature of both.
3.One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture
will be
(a) 80°C (b) more than 50°C but less than 80°C (c) 20°C (d) between 30°C and 50°C
4. . Stainless steel pans are usually provided with copper bottoms. The reason for this could be that
(a) copper bottom makes the pan more durable.
(b) such pans appear colourful.
(c) copper is a better conductor of heat than the stainless steel
(d) copper is easier to clean than the stainless steel.
5. In solids, heat gets transferred through the process of:
(a) conduction (b) radiation (c) convection (d) none of these
6. When a metal is heated, it generally.
(a) expends (b) contracts (c) remains the same (d) may contract or expand
7. Which of the following expands most on heating:
(a) solids (b) liquids (c) gases (d) sand
8. The range of a clinical thermometer is:
(a) 35O to 42OC (b) 0O to 100OC (C) 30O to 40OC (d) 0O to 200OC
9. The Colour which is the best radiator of heat is:
(a) White (b) Black (c) Blue (d) Yellow
10. A liquid which is a good conductor of heat is:
(a) water (b) hydrogen (c) oil (d) mercury
VERY SHORT ANSWER TYPE QUESTIONS (1 MARKS EACH)
1. Name the two metals that are the best conductors of heat ?
2. Define the term radiation ?
3. Name a liquid which is a good conductor of heat ?
4. Name the colour which is the best radiator of heat ?
5. What according to kelvin scale , is the freezing point and boiling point of water ?
6. What is the range of clinical thermometer?
7. In which method of transfer of heat on median is required?
8. By which device temperature of an object can be majored?
9. What is the unit of temperature?
10. What is the normal temperature of body ?
SHORT ANSWER TYPE QUESTIONS (2 MARKS EACH)
1. Give two examples each of conductors and insulators of heat.
2. State difference between Land breeze and Sea breeze.
3. State the difference between clinical thermometer and laboratory thermometer.
4. Why are cooking utensils made of aluminium and iron?
5. Why is mercury used in thermometers?
6. What is conduction?
7. What are insulator ? Give one example.
8. State the difference between heat and temperature ?
9. What are conductors ?
10. Why is the handle of metallic kettle with stripes of canes?
ANSWER THESE QUESTIONS (3 MARKS EACH)
1. State similarities and differences between the laboratory thermometers
and the clinical thermometer
2. What are poor conductors of heat give two examples.
3. Why do room heater have polished reflectors at the back of the heating element ?
4. Why do solids conduct heat better than liquid and liquid conduct heat better than gases ?
5. Why are houses made of mud and bricks in rural areas ?
LONG ANSWER TYPE QUESTIONS (5 MARKS EACH)
1. Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one
thick piece of clothing .
2. Explain with the help of the diagram convection of heat in water.
3. Explain with an activity flow of heat through a metal strip.
4. In place of hot climate it is advised that the outer walls of houses bee painted white explain ?
5. Draw Clinical Thermometer and Laboratories Thermometer ?
FILL IN THE BLANKS (1 MARKS EACH)
(1) The hotness of an object is determined by its __________.
(2) Temperature of boiling water cannot be measured by a_____________ thermometer.
(3) Temperature is measured in degree ______________.
(4) No medium is required for transfer of heat by the process of__________.
(5) A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process
of ______
(6) Clothes of ______________ colours absorb heat better than clothes of light colours.
(7) The unit in which temperature is measured is……………………………….
(8) We receive the sun’s energy by……………………………………….
(9) Transfer of heat in liquids and gases takes place by…………………………………
(10) The hotter molecules of liquids and gases move to colder regions to transfer……………….