Revision Series | Science and Tech | Miscellaneous | 102

August 24, 2023

Potassium Permanganate is used for purifying drinking water, because

(A) It is a sterilizing agent
(B) It is an oxidizing agent
(C) It is a reducing agent
(D) It dissolves the impurities of water

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ANSWER : B

The gases used in different types of welding would include

(A) Oxygen, acetylene and argon
(B) Oxygen, hydrogen, acetylene and nitrogen
(C) Oxygen and hydrogen
(D) Oxygen and acetylene

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ANSWER : D

Select the four statements about Plasmodium that are true.
A. Inside an infected mosquito, haploid gametes fuse, forming a diploid zygote that develops into an oocyst
B. Plasmodium cells infect two specific types of cells in humans.
C. Plasmodium cells are transferred to humans through mosquito saliva.
D. The complete life cycle of Plasmodium requires two hosts.

(A) A and B
(B) A and C
(C) B, C and D
(D) All of the above

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ANSWER : D

The radioactive element most commonly detected in humans is

(A) Plutonium-238
(B) Cobait-60
(C) Iodine-131
(D) Potassium-40

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ANSWER : D

Which of the following is likely during vigorous exercise?

(A) Blood will be diverted to the digestive organs.
(B) Capillaries of the active muscles will be engorged with blood.
(C) Blood flow to the kidneys increases.
(D) The skin will be cold and clammy

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ANSWER : B

At present, scientists can determine the arrangement or relative positions of genes of DNA sequences on a chromosome. How does this knowledge benefit us?
1. It is possible to know the pedigree of livestock.
2. It is possible to understand the causes of all human diseases.
3. It is possible to develop disease-resistant animal breeds.
Which of the statements given above is/are correct?

(A) 1 and 2 only
(B) 2 only
(C) 1, 2 and 3
(D) 1 and 3 only

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ANSWER : C

What does an airbag, used for the safety of a car driver, contain?

(A) Sodium Azide
(B) Sodium Bicarbonate
(C) Sodium Nitrite
(D) Sodium Peroxide

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ANSWER : A

An electrical charge triggered by automobile impact causes sodium azide to explode and convert to nitrogen gas inside the airbag. Sodium azide is used as a chemical preservative in hospitals and laboratories.

For Galvanizing Iron, which of the following Metals is used?

(A) Copper
(B) Aluminum
(C) Zinc
(D) Lead

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ANSWER : C

the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.

The weight of an object will be minimum when it is placed at

(A) The South pole
(B) The Center of the earth
(C) The North Pole
(D) The Equator

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ANSWER : B

The weight of an object is minimum when it is placed at the centre of the earth because when an object is in the centre, experiences gravitational pull from all directions & the weight of an object maximum on earth is on the poles.

Which of the following plants is not capable of manufacturing its own food?

(A) Mushroom
(B) Cabbage
(C) Carrot
(D) Algae

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ANSWER : A

In fireworks, the green flame is produced because of

(A) Potassium
(B) Barium
(C) Sodium
(D) Mercury

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ANSWER : B

Which of the following foods does not support bacterial growth?

(A) Cooked rice
(B) Raw Carrots
(C) Refried beans
(D) Sauted onions

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ANSWER : B

Which one of the following types of waves are used in a night vision apparatus?

(A) Infra-red waves
(B) Microwaves
(C) None of the above
(D) Radio waves

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ANSWER : A

A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive, and O positive. The blood group of the adopted son is

(A) Cannot be determined on the basis of the given data
(B) O Positive
(C) A Positive
(D) B Positive

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ANSWER : B

Which one of the following types of laser is used in laser printers?

(A) Semiconductor laser
(B) Gas laser
(C) Excimer
(D) Dye laser

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ANSWER : A