CBSE Class 6 Science Changes Around Us MCQs

Question. A tight metal lid on a jar of jam loosens when it is held in hot water because the hot water causes the _______.
a. Glass jar to contract.
b. Metal lid to contract.
c. Glass jar to expand more than the metal lid.
d. Metal lid to expand more than the glass jar.

Answer : D

Question. Which option correctly identifies processes X and Y? Process X: Gives out both heat and light. Process Y: Carried out by both plants and animals  

a. A
b. B
c. C
d. D

Answer : D

Question. What does 'humidity' exactly refer to?
a. The level of water vapour in the air.
b. The level of rainfall.
c. The level of pollution in the air.
d. The level of oxygen in the air.

Answer : A

Question. Why does the moon appear in different shapes every night?
a. The moon's real shape changes every night.
b. The moon reflects a part of the light from the earth.
c. The earth blocks the sun's light from reaching the moon.
d. From the earth's position, only a part of the lit portion of the moon is seen.

Answer : D

Question. Ramesh is performing an experiment to determine the boiling point of a liquid. The boiling point will NOT change if:
a. salt is added to the liquid.
b. sugar is added to the liquid.
c. the quantity of liquid is increased.
d. the experiment is conducted on a hill station.

Answer : C

Question. What would be the weather in New Delhi when the position of the earth is at R as shown in the figure?

a. Summer
b. Winter
c. Rainy Season
d. Spring

Answer : B

Question. On which of the planets listed above would an iron sheet melt if it were kept on the surface?

a. Uranus
b. Venus
c. Saturn
d. None of the above

Answer : D

Question. If oxygen and mercury were present on Uranus, what state of matter would each be in?

a. Oxygen - Solid; Mercury - Solid
b. Oxygen - Solid; Mercury - Liquid
c. Oxygen - Liquid; Mercury - Solid
d. Oxygen - Gas; Mercury- Liquid

Answer : C

Question. Shown here is the picture of an ink filler. When this ink filler is dipped into a beaker of water and the bulb is pressed, air bubbles appear in the water. Why does this happen?

a. Air in the atmosphere forms the bubbles.
b. The air in the ink filler is released to form bubbles.
c. The liquid rushes into the filler forming bubbles.
d. The air in the water forms bubbles.

Answer : B

Question. Kiran's mother placed a candle in a bowl as shown and lit it. A little while later, Kiran opened a bottle of Pepsi and poured it quickly into the bowl. What will happen?

a. The candle flame will burn brighter.
b. The candle flame will be put out.
c. The candle and flame will be completely unaffected.
d. The candle will break.

Answer : B

Question. A piece of brown cork was cut into small pieces. Which of these will change as a result?
a. its size
b. its colour
c. the nature of its atom
d. its density

Answer : A

Question. John's bedroom windows shake when crackers are burst near his house. Which of these scientific facts explains why this happens?
a. Sound waves transmit energy.
b. Heat waves transmit energy.
c. Light waves transmit energy.
d. Radio waves transmit energy.

Answer : A

Question. Three beakers of different sizes are filled with water to the same height. The temperature of water is the same in all the beakers. If a cube of ice is added to each of the four beakers, which one will have the lowest temperature after the ice melts?

Answer : A

Question. Manish and Revati are making lemon juice for themselves. Manish wants cold juice, so he adds sugar to “cold water”. Revati adds the same amount of sugar, but the water is at “room temperature”. In which case will the sugar dissolve faster and why?
a. Revati's, because as the temperature of water increases, sugar dissolves faster.
b. Manish's, because as the temperature of water decreases, sugar dissolves faster
c. In both cases the time to dissolve will be the same - the temperature of water makes no difference to this.
d. It depends on the exact temperature of the water in the two glasses.

Answer : A

Question. Sprinkling a little salt on ice helps to melt the ice. Shakun has three glasses of water with him. Glasses A and C have pure water and Glass B has salt water. He puts glasses A and B into the freezer and leaves C outside. Which of these will take the least time to freeze?
a. glass A
b. glass B
c. both glasses A and C will freeze at the same time.
d. glass C

Answer : A

Question. Which of these is the most suitable way to find out if iron or copper is a better conductor of heat?

Answer : B

Question. Take four identical bottles. Fill two bottles P and Q with cold water and Y and Z with hot water.Mix red colouring material in bottles P and Z. Close the mouths of bottles Q and Y with your thumbs. Bring the bottles over the mouths of bottles Z and P respectively and place it on them as shown in the figure.What is likely to be the visible change?
a. The water in bottles Y and Q becomes coloured at the same time.
b. The water in bottle Y becomes coloured first
c. The water in bottle Q becomes coloured first
d. No colour change occurs in Q or Y.

Answer : C

Question. The time a cube of ice will take to melt will ______ if it is wrapped in a piece of cloth from a blanket.
a. increase
b. decrease
c. stay unchanged
d. (depends on the size of the cube)

Answer : A

Question. Which of the following is a chemical change?
a. Mixing salt in water.
b. Melting of ice.
c. Formation of curd.
d. Breaking of glass.

Answer : C

Question. Which of these options contains processes involving change of state from LIQUID to GAS?
a. evaporation and sublimation
b. evaporation and respiration
c. respiration and transpiration
d. evaporation and transpiration

Answer : D

Question. Which of these is a chemical reaction?
a. a piece of chalk breaking
b. sugar dissolving in water
c. a piece of cork slicing
d. iron rusting

Answer : D

Question. Identify the CHEMICAL CHANGE among the following.
a. Mixing salt in water
b. Melting of ice
c. Formation of curd
d. Breaking of glass

Answer : C

Question. Kajol removes the lid of an empty metal can and fills it with a little water. She then heats the can till the water boils. If she quickly removes the can and covers it tightly with its lid, what is likely to happen? 

a. The can will explode.
b. The can will get crushed.
c. The lid will be blown away.
d. The can will remain unaffected.

Answer : B

Question. Sonia wants to find out if ice will melt faster in fresh water or salt water. She takes 2 containers with 200 ml of water in each and adds 2 tablespoons of salt to water in one of the containers. She then adds one ice cube each to each container and notes down the time taken by both ice cubes for melting completely. Is there any mistake in the set-up of Sonias experiment ?

a. No, she has planned all the variables correctly.
b. Yes, she should have added salt in both the containers.
c. Yes, the containers should be exactly of the same shape.
d. Yes, the ice cubes should be of similar size and weight.

Answer : D

Question. If you burn your hand by accidentally putting your hand into very hot water, what should you do immediately to treat it?
a. Immerse the burned part in cold water for at least 10 minutes.
b. Cover the burned part with a rug for at least 10 minutes.
c. Apply ointment and rub it in for at least 10 minutes
d. Cover the burned part with a wet cloth for at least 10 minutes.

Answer : A

Question. It is winter, and the students of class 5 would like to choose a dry, sunny day for their picnic. Today is Sunday, and the newspaper has this day weather forecast. Which of these days would be the best for the picnic?

a. Monday
b. Tuesday
c. Wednesday
d. Thursday

Answer : D

Question. Bindu's teacher asked a few students to perform an experiment described in the textbook. However, Bindu found that her results were different from what was described in the book. What should Bindu do?
a. She should keep repeating the experiment till she gets the result reported in the textbook.
b. She should change the observations so that she gets the result reported in the textbook
c. She should use her friends' observations.
d. She should report her observations the way they are.

Answer : D

Question. Chemical energy --------------> Heat energy --------------> Mechanical energy. In which of the following is the energy change as given above?
a. A torch
b. A steam engine
c. A windmill
d. An electric bulb

Answer : B

Question. Winds blow because
a. trees shake.
b. birds fly.
c. of temperature differences between places.
d. the earth revolves around the sun.

Answer : C

Question. Compared to the days in the beginning of the monsoon season, days at the end of the season in India are
a. longer.
b. shorter
c. of the same length.
d. longer or shorter depending on the place.

Answer : B

Question. _____ is an irreversible change.

a. Burning of coal  
b. Melting of wax
c. Melting of ice
d. Formation of ice

Answer : A

Question. Which of the following is an irreversible change:

a. A toy aeroplane made by folding paper

b. A roti

c. A balloon changes its size and shape on blowing air into it
d. Melting of wax

Answer : B

Question. Which of the following is not an example of the changes that occur by mixing two substances?
a. Salt dissolved in water
b. Mixing sand and water
c. Sugar dissolved in water
d. Burning of a matchstick

Answer : D

Question. A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
a. Yes
b. No
c. Can’t say
d. All of theabove

Answer  : B

Answer Key