Assertion and Reason


1.

Directions: Choose the correct alternative from the following.

Assertion :Photosynthesis takes place in all green plants.

Reason :  Chlorophyll is essential for photosynthesis.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option B

Photosynthesis takes place in all green plants which is having Chlorophyll.

2.

Directions: Choose the correct alternative from the following.

Assertion :Water kept in earthen pots gets cooled in summer

Reason :Evaporation causes cooling

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option A

Earthen pots have pores through which water evaporates, causing cooling.

3.

Directions: Choose the correct alternative from the following.

Assertion :In the upper course, the main work of the river is erosion

Reason :  River flows swiftly in the upper course.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option A

In it’s upper course, the river rushes down a step slope and so flows swiftly, causing mainly erosion in this region.

4.

Directions: Choose the correct alternative from the following.

Assertion :DDT has nowadays lost its use as an insecticide.

Reason :DDT is harmful to man.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option B

DDT has lost its use as an insecticide because insects have developed immunity against it. How ever, it is truth that DDT is harmful to man

5.

Directions: Choose the correct alternative from the following.

Assertion :Sprouting should not be done before consuming the grains.

Reason :  Sprouting kills many vital vitamins.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason isfalse

Option D

Sprouted grains should be consumed because sprouting enhance the nutrient content of the grains.

6.

Directions: Choose the correct alternative from the following.

Assertion :Roughage prevents constipation.

Reason :  Roughage adds bulk to the food.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option A

Roughage adds bulk to the food and makes its passage through the stomach easier, thus preventing constipation.

7.

Directions: Choose the correct alternative from the following.

Assertion :An iron ball floats on mercury but gets immersed in water

Reason :The specific gravity of iron is more than that of mercury.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option C

Iron with specific gravity less than that of mercury bur more than that of water, floats in the former but gets immersed in the second.

8.

Directions: Choose the correct alternative from the following.

Assertion :Bronze is used for making statues.

Reason :  Bronze is an alloy of copper and tin.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option B

 Bronze is an alloy of copper and tin. It is resistant to corrosion and so it is used to make statues.

9.

Directions: Choose the correct alternative from the following.

Assertion :When a body is dipped in a liquid fully or partially, there is a decrease in its weight.

Reason :  The decrease in weight is due to the higher density of the displaced liquid.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option C

When a body is dipped in a liquid, there is a decrease in weight due to the upward thrust exerted on it by the water.

10.

Directions: Choose the correct alternative from the following.

Assertion (A):Eskimos reside in igloos. sss

Reason (R)     :  No other material except snow is available.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option C

Eskimos live in snow houses called igloos because snow, being a bad conductor of heat, these houses are warm inside.

11.

Directions: Choose the correct alternative from the following.

Assertion (A): There is no vaccine for AIDS.

Reason (R)   : The AIDS virus changes its genetic code

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option A

A vaccine contains the inactivated germs of the disease. But the AIDS virus changes its genetic code and so on vaccine has been invented for it.

12.

Directions: Choose the correct alternative from the following.

Assertion (A) : Carbon monoxide when inhaled causes death.

Reason (R) : Carbon monoxide combines with hemoglobin

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option A

Carbon monoxide, when inhaled, combines with hemoglobin of blood to form carboxyhaemoglobin which inhibits the transport of oxygen.

13.

Directions: Choose the correct alternative from the following.

Assertion (A): We feel comfortable in hot and humid climate.

Reason (R) : Sweat evaporates faster in humid climate.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option D

We feel uncomfortable in hut and humid climate because in hot weather, body sweats more but due to high humidity, this sweat does not evaporate easily. 

14.

Directions: Choose the correct alternative from the following.

Assertion (A) :  Glass tumbler breaks in winter when hot water is poured in it.

Reason (R)    :  When hot water is poured. the outer surface of glass expands.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option C

When in winter, hot water is poured in the glass tumbler. its inner surface tends to expand while the Outer surface in contact with cold atmosphere does not. This opposite interaction causes the tumbler to break.

15.

Directions: Choose the correct alternative from the following.

Assertion (A) :  The Indian Constitution came into force with effect from 26th January. 1950.

Reason (R)    :  26th January is celebrated as the Republic Day.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option B

The Indian Constitution came into force with effect from January 26, 1950 and since then this day is celebrated as the Republic Day.

16.

Directions: Choose the correct alternative from the following.

Assertion (A)  : In India, females have higher life expectancy than the males.

Reason (R)    : Females receive a better diet.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option D

In India, due to high birth rate and due to neglect, females have a lower life expectancy than the males and although females need a better diet, they do not receive it.

17.

Directions: Choose the correct alternative from the following.

Assertion (A)  : In India, people elect their own representatives.

Reason (R)    : India is a democracy.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option A

India, being a democracy, it is a government run by the representatives elected by its people

18.

Directions: Choose the correct alternative from the following.

Assertion (A) :   Bats can fly in the night.

Reason (R) :      Bats emit ultrasonics.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option A

Bats can fly in the night because they can trace the obstacle in the path by perceiving the echo of the ultrasonic sound emitted by them after it is reflected by the obstacle.

19.

Directions: Choose the correct alternative from the following.

Assertion (A) :  Clothes are not washed properly in hard water. 

Reason (A)    :  Hard water contains many minerals.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option B

Clothes are not washed properly in hard water because it does not form lather with soap. However, it is true that hard water contains many minerals.

20.

Directions: Choose the correct alternative from the following.

Assertion (A) : Roughage prevents constipation.
Reason (R) : Roughage adds bulk to the food.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option A

Roughage adds bulk to the food and makes its passage through the stomach easier, thus preventing constipation

21.

Directions: Choose the correct alternative from the following.

Assertion (A) : Seeds should be treated with fungicide before being sown.
Reason (R) : Seeds do not germinate, unless treated with fungicide solution.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option C

Seeds are treated with fungicides before sowing to avoid seed-borne diseases. However, seeds may germinate, even if not treated with fungicide solution.

22.

Directions: Choose the correct alternative from the following.

Assertion (A) : Food materials should not be soaked in water for a long time.
Reason (R) : Washing leads to loss of Vitamin A and vitamin D from the foodstuff.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option C

Food materials should not be soaked in water for long since washing leads to loss of water soluble vitamin B and vitamin C.

23.

Directions: Choose the correct alternative from the following.

Assertion (A) : Water kept in earthen pots gets cooled in summer.
Reason (R) : Evaporation causes cooling.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option A

Earthen pots have pores through which water evaporates, causes cooling

24.

Directions: Choose the correct alternative from the following.

Assertion (A) : Diamond is used for cutting glass.
Reason (R) : Diamond has a high refractive index.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option B

Diamond is very hard due to its rigid three dimensional structure and so, it is used for cutting glass. Refractive index of diamond is high and gives it the greater transparency and brilliance.

25.

Directions: Choose the correct alternative from the following.

Assertion (A) : We feel comfortable in hot and humid climate.
Reason (R) : Sweat evaporates faster in humid climate.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option D

We feel uncomfortable in hot and humid climate because in hot weather, body sweats more but due to high humidity, this sweat does not evaporate easily.

26.

Directions: Choose the correct alternative from the following.

Assertion (A) : Simla is colder than Delhi.
Reason (R) : Simla is at a high altitude compared to Delhi.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option A

Simla is colder than Delhi because it is situated at a higher altitude and temperature decreases by 1^0 C for every 165 meters of ascent.

27.

Directions: Choose the correct alternative from the following.

Assertion (A) : Bronze is used for making statues.
Reason (R) : Bronze is an alloy of copper and tin.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option B

Bronze is an alloy of copper and tin. It is resistance to corrosion and so it is used to make statues

28.

Directions: Choose the correct alternative from the following.

Assertion (A) : Baking soda creates acidity in the stomach.
Reason (R) : Baking soda is alkaline.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option D

Baking soda, being alkaline, neutralises the acidity in the stomach and removes it.

29.

Directions: Choose the correct alternative from the following.

Assertion (A) : Copper is used to make electric wires.

Reason (R) : Copper has very low electrical resistance.

A. Both Assertion and Reason are true and Reason is the correct explanation of A
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option A

A low electrical resistance of copper makes it a good electric conductor. So, it is used to make electric wires.

30.

Directions: Choose the correct alternative from the following.
Assertion :  Photosynthesis takes place in all green plants.
Reason :  Chlorophyll is essential for photosynthesis.
 

A. Both Assertion and Reason are true and Reason is the correct explanation of A.
B. Both Assertion and Reason are true but Reason is not the correct explanation of A.
C. Assertion is true but Reason is false
D. Assertion is false but Reason is true

Option B

Expl : Photosynthesis takes place in all green plants which is having Chlorophyll.
 

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