CBSE class 7 Science Short Questions & Answers

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

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

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

By Gkseries see more questions

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

By Gkseries see more questions

Download PDF