Question 1

Which among the following is an incorrect option?

Accepted Answer

The statement 'Atom is electrically neutral due to presence of protons and electrons inside the nucleus' is incorrect. An atom is electrically neutral because it has an equal number of positively charged protons in the nucleus and negatively charged electrons in the electron cloud surrounding the nucleus, not because electrons are inside the nucleus. Electrons orbit the nucleus and have a very small mass compared to protons and neutrons.

Question 2

Select the incorrect statement out of the following:

Accepted Answer

Acrylic is a synthetic fiber and is not prepared from cotton. It is not called artificial silk; it is often referred to as artificial wool. Cotton absorbs moisture and is suitable for summer clothing. Polycarbonate is used for CDs, and Teflon is used for non-stick coatings.

Question 3

Which of the following statements about graphite and diamond is true?

Accepted Answer

Graphite and diamond have different crystal structures, hardness, and electrical conductivity. Both are forms of carbon, so they can undergo similar chemical reactions such as combustion to form carbon dioxide.

Question 4

Which of the following is the major constituent of liquified petroleum gas (LPG)?

Accepted Answer

LPG is mainly composed of butane and propane, with butane being a major constituent. It is used for cooking, transportation, and camping due to its high energy content per unit volume.

Question 5

Water passed from the soil into the roots by a physical process called

Accepted Answer

Water enters plant roots primarily through osmosis, which is the movement of water across a selectively permeable membrane from an area of low solute concentration (soil) to high solute concentration (root cells).

Question 6

Biodegradable wastes can usually be converted into useful substances with the help of

Accepted Answer

Bacteria are natural decomposers that break down biodegradable wastes into simpler compounds such as compost, which can be used as nutrient-rich fertilizer. Viruses, nuclear proteins, and radioactive substances do not play a role in this process.

Question 7

In the nighttime, it is not advised to sleep under trees because

Accepted Answer

Trees undergo respiration at night, consuming oxygen and releasing carbon dioxide. Excess CO2 concentration in enclosed spaces may cause discomfort. They do not release harmful gases or carbon monoxide.

Question 8

Insectivorous plants grow in soil deficient in

Accepted Answer

Insectivorous plants thrive in nitrogen-deficient soils. They supplement nitrogen by trapping and digesting insects, which provide nitrogen-containing compounds like amino acids.

Question 9

Stem of a plant helps in distributing food to all parts of the plant. It also helps in

Accepted Answer

The stem performs multiple functions including distributing food, storing food, providing structural support, assisting in limited photosynthesis, and facilitating gas exchange. Hence, 'None of the above' is correct.

Question 10

In transfusion, blood must be compatible not only in blood type but also in

Accepted Answer

Blood transfusion compatibility requires matching both the blood type (A, B, AB, O) and Rh factor (positive or negative) to prevent adverse reactions. Other factors like cell counts or race are not relevant.

67th Prelims Cancelled 2022

Which among the following is an incorrect option?

Select the incorrect statement out of the following:

Which of the following statements about graphite and diamond is true?

Which of the following is the major constituent of liquified petroleum gas (LPG)?

Water passed from the soil into the roots by a physical process called

Biodegradable wastes can usually be converted into useful substances with the help of

In the nighttime, it is not advised to sleep under trees because

Insectivorous plants grow in soil deficient in

Stem of a plant helps in distributing food to all parts of the plant. It also helps in

In transfusion, blood must be compatible not only in blood type but also in

Pituitary gland is located in

The universal acceptor blood group is

Which of the following rays/waves are used to know the growth of fetus in the womb?

Pneumonia is an infection of

A person standing in front of a mirror finds his image larger than himself. This implies that the mirror is

A fan produces a feeling of comfort during the hot weather because

Twinkling of stars in clear sky during nighttime can be explained with

Hydrogen bomb is based on the principle of

Food gets cooked faster in a pressure cooker because

Which of the following metals is obtained by the electrolytic method?