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Free download in PDF CBSE class 7 Science Short Questions & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 7 Students.
41
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.
Answer: copper is a better conductor of heat than the stainless steel.
42
Higher the temperature of the body _____ is the kinetic energy of the molecules of that body?
[A]
higher
[B]
lower
[C]
same
[D]
none of these
43
When matter gets warmer, the atoms and molecules in that matter __________________
[A]
stand still
[B]
move faster
[C]
move slower
[D]
can't say
44
Chemical name of Oil of Vitriol is __________
[A]
Nitric acid
[B]
Acetic acid
[C]
Sulphuric acid
[D]
Sodium Hydroxide
45
Sodium hydroxide is found in
[A]
Lemon
[B]
Soap
[C]
Oil of Vitriol
[D]
Table Salt
46
Lactic acid is found in
[A]
Curd
[B]
Apple
[C]
Soap
[D]
Lime
47
Acetic acid is found in
[A]
Curd
[B]
Spinach
[C]
Vinegar
[D]
Citrus fruits
48
Which of the following colours is given by phenolphthalein in a basic salt solution.
[A]
yellow
[B]
pink
[C]
orange red
[D]
colourless
49
The most commonly used natural indicator’ Litmus’ is extracted from
[A]
Lichens
[B]
Turmeric
[C]
Beet Root
[D]
China rose
50
Which of the following is a strong acid?
[A]
acetic acid
[B]
nitric acid
[C]
lactic acid
[D]
citric acid
51
Special type of substances used to test whether a substance is acidic/basic are known as
[A]
Indicators
[B]
Acids
[C]
Bases
[D]
Salt
52
Substances which are bitter in taste, feel soapy on touching are known as
[A]
Acids
[B]
Bases
[C]
Indicators
[D]
Neutral solution
53
Acids turns blue litmus to ______
[A]
green
[B]
yellow
[C]
red
[D]
black
54
Which of the following is used in match industry.
[A]
Potassium chlorate
[B]
Sodium carbonate
[C]
Sodium chloride
[D]
Sodium bicarbonate
Answer: Potassium chlorate
55
The word acid comes from the Latin word 'acere' which means
[A]
Sweet
[B]
Salty
[C]
Sour
[D]
Neutral
56
When carbon dioxide gas is passed through lime water, it turns lime water into ________
[A]
milky
[B]
blue
[C]
silver
[D]
golden
57
The process of obtaining Salt by the evaporation of sea water is known as ____________.
[A]
Crystallisation
[B]
Sublimation
[C]
Galvanisation
[D]
Amalgamation
58
Any characteristic that gives a sample of matter the ability/inability to undergo a change that alters its composition. It is called ______.
[A]
chemical prpoerty
[B]
physical peoprty
[C]
physical change
[D]
chemical change
Answer: chemical prpoerty
59
Formation of gas bubbles is _________.
[A]
a physical change
[B]
a physical property
[C]
a chemical change
[D]
a chemical prpoerty
Answer: a chemical change
60
Which of the following is a chemical property of Aluminium?
[A]
It corrodes with air
[B]
It is soft and malleable
[C]
It melts at 660°C
[D]
Its density is 2.70 g/cm3
Answer: It corrodes with air
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