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Free download in PDF CBSE class 7 Science Objective Type Questions & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 7 Students.
(21)
The fleece are combed to remove _______
[A]
Burrs.
[B]
Dust.
[C]
Low quality hair.
[D]
None of these
(22)
Which country is the most producing silk in the world?
[A]
Bangladesh
[B]
India
[C]
China
[D]
none of these
(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
(26)
Which of the following process is NOT part of wool extraction?
[A]
Shearing
[B]
Scouring
[C]
Sorting
[D]
Reeling
(27)
Animal Fibres are made up of
[A]
cellulose
[B]
protein
[C]
nylon
[D]
rayon
(28)
Vegetable fibres are made up of
[A]
cellulose
[B]
nylon
[C]
protein
[D]
rayon
(29)
Which of the following is NOT a Vegetable fibre?
[A]
flax
[B]
silk
[C]
hemp
[D]
jute
(30)
Device used for measuring temperatures is called a
[A]
Barometer
[B]
Odometer
[C]
Thermometer
[D]
Speedometer
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
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
35
Boiling point of water is
[A]
0° C
[B]
100° C
[C]
357° C
[D]
-39°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
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
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