M.C.Q. [1 M]

MCQ 11 Mark

Weeds affect the crop plants by

A
dominating the plants to grow
B
killing of plants in field before thy grow
C
all of these
✓
competing for various resources of crops(plants) causing low availability of nutrients

Answer

Correct option: D.

competing for various resources of crops(plants) causing low availability of nutrients

(d) competing for various resources of crops (plants) causing low availability of nutrients
Explanation: Unwanted plants which grow in the field are called weeds, e.g. Xanthium (gokhroo), Parthenium (gajar ghas),

Cyperinus rotundus (motha). They compete with crops for various resources; like sunlight, water and nutrients. Thus, weeds

hamper the growth of crops.

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MCQ 21 Mark

Which of the following solutions has the highest mass by mass percentage?

A
20 g of sodium carbonate in 90 g of water
B
15 g of sugar in 160 g of water
C
10 g of sodium chloride in 200 g of water
✓
60 g of potassium permanganate in 200 g of water

Answer

Correct option: D.

60 g of potassium permanganate in 200 g of water

(d) 60 g of potassium permanganate in 200 g of water
Explanation: Mass by mass percentage $=\frac{\text { Mass of solute }}{\text { Mass of solution }} \times 100$

Concentration of solution $I=\frac{10}{10+200} \times 100=4.76 \%$

Concentration of solution $II =\frac{15}{160+15} \times 100=8.57 \%$

Concentration of solution III $=\frac{60}{200+60} \times 100=23.07 \%$

Concentration of solution IV $=\frac{20}{90+20} \times 100=18.18 \%$

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MCQ 31 Mark

Metanil yellow, an adulterant used in Arhar dal is basically:

✓
a dye
B
an acid
C
a detergent
D
a base

Answer

Correct option: A.

a dye

(a) a dye
Explanation: Metanil yellow is a yellow colour dye, generally used colouring food material, for e.g. starch when dyed with

metanil yellow looks like turmeric. Poor quality dal when dyed with metanil yellow looks superior quality dal.

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MCQ 41 Mark

Kitchen of the cells

A
Golgi apparatus
B
Endoplasmic reticulum
✓
Chloroplast
D
Mitochondria

Answer

Correct option: C.

Chloroplast

(c) Chloroplast
Explanation: Chloroplasts are special structures present only in plant cells. With the help of this chlorophyll, the plants

prepare their food in the presence of water, sunlight and oxygen. Hence, chloroplasts are called the kitchen of a plant cell.

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MCQ 51 Mark

Lignified or thickened cell wall is a characteristic feature of

A
phloem
✓
xylem
C
parenchyma
D
collenchyma

Answer

Correct option: B.

xylem

(b) xylem
Explanation: The xylem is one of the conductive tissues in plants. It is a complex tissue composed of many types of cells. The

main function of xylem is to conduct water and minerals from roots to leaves. The secondary xylem also provides mechanical

support due to the presence of a thick lignified cell wall.

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MCQ 61 Mark

The mass number of an isotope of an element is 295, if its nucleus has 196 neutrons. What is its atomic number?

A
98
B
199
C
491
✓
99

Answer

Correct option: D.

(d) 99
Explanation: Atomic number is the number of protons present in the given element and can be calculated by subtracting

neutrons from mass number.

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MCQ 71 Mark

Slope of a velocity-time graph gives

A
the displacement
✓
the acceleration
C
the distance
D
the speed

Answer

Correct option: B.

the acceleration

(b) the acceleration
Explanation: The area under a velocity-time graph represents the distance covered and the gradient of a velocity-time graph

represents the acceleration.

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MCQ 81 Mark

For performing an experiment to verify Archimedes principle, a student used a spring balance with a zero error of 4 g wt. He used to measure the weight of a solid metallic block as shown in the figure below. The solid metallic block was then lowered in water contained in an overflowing jar and the water displaced by this block was collected in graduated or measuring cylinder as shown in figure.

The apparent loss in weight of the solid metallic block is:

A
38 g wt
B
35 g wt
✓
40 g wt
D
30 g wt

Answer

Correct option: C.

40 g wt

(c) 40 g wt
Explanation: Loss in weight = Difference in reading, i.e. 84 – 44 = 40 units. [Scale is not graduated with respective units]

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MCQ 91 Mark

Glands in our body are formed by

A
connective tissue
✓
epithelial tissue
C
smooth muscles
D
adipose tissue

Answer

Correct option: B.

epithelial tissue

(b) epithelial tissue
Explanation: A gland is a group of cells. Epithelial tissues are thin tissues that cover all the exposed surfaces of the body. They

form the external skin, the inner lining of the mouth, digestive tract, secretory glands, the lining of hollow parts of every organ

such as the heart, lungs, eyes, ears, the urogenital tract, as well as the ventricular system of the brain and central canals of the

spinal cord.

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MCQ 101 Mark

What are c and d?

A
$c =$ multiply by $N _{ A } d =$ multiply by $N _{ A }$
B
$c=$ multiply by $N _{ A }, d =$ divide by $N _{ A }$
C
$c=$ divide by $N _{ A } d =$ divide by $N _{ A }$
✓
$c =$ divide by $N _{ A } d =$ multiply by $N _{ A }$

Answer

Correct option: D.

$c =$ divide by $N _{ A } d =$ multiply by $N _{ A }$

(d)$c =$ divide by $N _{ A } d =$ multiply by $N _{ A }$
Explanation: No. of moles $=$ No. of molecules $\div \underbrace{\text { Avogadro's number }}_c$

Number of molecules $=$ Number of moles $\times \underbrace{\text { Avogadro's number }}_d$

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MCQ 111 Mark

Ribosomes are made up of ____________.

✓
Both RNA and Proteins
B
RNA
C
Lipoprotein
D
Proteins

Answer

Correct option: A.

Both RNA and Proteins

(a) Both RNA and Proteins
Explanation: Ribosomes consist of two major components: the small ribosomal subunit, which reads the RNA, and the large

subunit, which joins amino acids to form a polypeptide chain. Each subunit is composed of one or more ribosomal RNA

(rRNA) molecules and a variety of ribosomal proteins (r-protein).

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MCQ 121 Mark

Specimens of plants and animals are preserved in:

A
acetone
B
methylated spirit
C
ethanol
✓
formalin

Answer

Correct option: D.

formalin

(d) formalin
Explanation: Specimen preservation means “longterm preservation of organisms either plant or animal in the best possible

condition. So that it can be accessed in the future as a reference collection for scientific purposes”. Formalin is the best

preservative for plants and animals.

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MCQ 131 Mark

Who is known as the Father of white revolution' in India?

A
Mrs. Indira Gandhi
B
Shri Jai Prakash Narain
✓
Dr.V. Kurein
D
Prof M.S. Swaminathan

Answer

Correct option: C.

Dr.V. Kurein

(c) Dr. V. Kurein
Explanation: Dr.V. Kurein is called as the 'Father of white revolution' in India because of his initiatives and immense

contribution to the dairy sector.

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MCQ 141 Mark

A car travels 10 m in 5 seconds, 20 m in the next 10 seconds, and 30 m in the last 10 seconds. The average speed of the motion is:

A
$30 ms^{-1}$
B
$2.2 ms^{-1}$
✓
$2.4 ms^{-1}$
D
$2.0 ms^{-1}$

Answer

Correct option: C.

$2.4 ms^{-1}$

(C)$2.4 ms^{-1}$
Explanation: The average distance covered in unit time by a moving object is called average speed. The average speed is the ratio of total distance covered and total time taken.
Average speed $=\frac{\text { Total distance convered }}{\text { Total time taken }}=\frac{10+20+30}{5+10+10}=\frac{60}{25}=2.4 ms^{-1}$

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MCQ 151 Mark

The most abundant material on the plant cell wall is:

A
proteins
B
lipids
C
wax
✓
cellulose

Answer

Correct option: D.

cellulose

(d) cellulose
Explanation: Cellulose is an important structural component of the primary cell wall of green plants, many forms of algae, and

the oomycetes. Some species of bacteria secrete it to form biofilms. Thus, cellulose is the most abundant organic polymer on

Earth.

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MCQ 161 Mark

Which one of the following is the correct set up to determine the melting point of ice

A
I
✓
III
C
IV
D
II

Answer

Correct option: B.

III

(b) III
Explanation: The bulb of the thermometer should be dipped in crushed ice to determine the melting point of ice.

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