CBSE class 7 Science Quiz | CBSE class 7 Science Short Questions & Answers

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Questions
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

Answer: higher
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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

Answer: move faster
44 Chemical name of Oil of Vitriol is __________
A Nitric acid
B Acetic acid
C Sulphuric acid
D Sodium Hydroxide

Answer: Sulphuric acid
45 Sodium hydroxide is found in
A Lemon
B Soap
C Oil of Vitriol
D Table Salt

Answer: Soap
46 Lactic acid is found in
A Curd
B Apple
C Soap
D Lime

Answer: Curd
47 Acetic acid is found in
A Curd
B Spinach
C Vinegar
D Citrus fruits

Answer: Curd
48 Which of the following colours is given by phenolphthalein in a basic salt solution.
A yellow
B pink
C orange red
D colourless

Answer: pink
49 The most commonly used natural indicator’ Litmus’ is extracted from
A Lichens
B Turmeric
C Beet Root
D China rose

Answer: Lichens
50 Which of the following is a strong acid?
A acetic acid
B nitric acid
C lactic acid
D citric acid

Answer: nitric 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

Answer: Indicators
52 Substances which are bitter in taste, feel soapy on touching are known as
A Acids
B Bases
C Indicators
D Neutral solution

Answer: Bases
53 Acids turns blue litmus to ______
A green
B yellow
C red
D black

Answer: red
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

Answer: Sour
56 When carbon dioxide gas is passed through lime water, it turns lime water into ________
A milky
B blue
C silver
D golden

Answer: milky
57 The process of obtaining Salt by the evaporation of sea water is known as ____________.
A Crystallisation
B Sublimation
C Galvanisation
D Amalgamation

Answer: Crystallisation
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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