CBSE class 7 Science Quiz | CBSE class 7 Science Objective Type Questions & Answers

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Questions
21 The fleece are combed to remove _______
A Burrs.
B Dust.
C Low quality hair.
D None of these

Answer: Burrs.
22 Which country is the most producing silk in the world?
A Bangladesh
B India
C China
D none of these

Answer: China
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23 Which of the following statements is NOT true?
A Workers in wool industry generally suffer from Sorter's disease.
B Bakhrwal is an Indian breed of sheep.
C Rayon is a natural fibre.
D Shearing is usually done in summer season.

Answer: Rayon is a natural fibre.
24 Sericulture is ________________.
A rearing of silk worms
B rearing of sheep
C cotton plantation
D rearing of honey bees

Answer: rearing of silk worms
25 Removal of wool from a sheep is known as __________.
A Rearing
B Sorting
C Shearing
D Scouring

Answer: Shearing
26 Which of the following process is NOT part of wool extraction?
A Shearing
B Scouring
C Sorting
D Reeling

Answer: Reeling
27 Animal Fibres are made up of
A cellulose
B protein
C nylon
D rayon

Answer: protein
28 Vegetable fibres are made up of
A cellulose
B nylon
C protein
D rayon

Answer: cellulose
29 Which of the following is NOT a Vegetable fibre?
A flax
B silk
C hemp
D jute

Answer: silk
30 Device used for measuring temperatures is called a
A Barometer
B Odometer
C Thermometer
D Speedometer

Answer: Thermometer
31 A polished silvery surface is
A good absorber of heat
B good reflector of heat
C poor reflector of heat
D None of these

Answer: good reflector of heat
32 Sea breeze is caused due to
A conduction
B convection
C radiation
D all of these

Answer: convection
33 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.

Answer: does not become cold.
34 A Thermos flask prevents loss or gain of heat by
A conduction only
B convection only
C radiation only
D all the above

Answer: all the above
35 Boiling point of water is
A 0° C
B 100° C
C 357° C
D -39°C

Answer: 100° C
36 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.

Answer: not flow from iron ball to water or from water to iron ball.
37 In Fahrenheit scale, water freezes at
A 0° F
B 32° F
C 40° F
D 212° F

Answer: 32° F
38 Bodies transmitting heat via radiation
A do not require any medium
B are liquids only
C make heat travels in one direction only.
D solids only

Answer: do not require any medium
39 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

Answer: between 30°C and 50°C
40 Unit of heat energy is
A kilogram
B metre
C joule
D degree

Answer: joule
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