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BPSC Prelims Past Year Paper- 2021 - BPSC (Bihar) MCQ


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30 Questions MCQ Test - BPSC Prelims Past Year Paper- 2021

BPSC Prelims Past Year Paper- 2021 for BPSC (Bihar) 2024 is part of BPSC (Bihar) preparation. The BPSC Prelims Past Year Paper- 2021 questions and answers have been prepared according to the BPSC (Bihar) exam syllabus.The BPSC Prelims Past Year Paper- 2021 MCQs are made for BPSC (Bihar) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for BPSC Prelims Past Year Paper- 2021 below.
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BPSC Prelims Past Year Paper- 2021 - Question 1

The radiations used in the treatment of muscle ache are

Detailed Solution for BPSC Prelims Past Year Paper- 2021 - Question 1

This is the electromagnetic spectrum beyond the visible range 3900 angstroms. Every warm object emits Infrared. Its uses are in the treatment of muscle pain, easing tension, cooking, and also in short-range communication i.e. remote, etc.

BPSC Prelims Past Year Paper- 2021 - Question 2

The total resistance of a circuit having two parallel resistors is 1.403 kilo-ohm. If one of the resistors is 2.0 kilo-ohm, then the other resistor will be

Detailed Solution for BPSC Prelims Past Year Paper- 2021 - Question 2

Let the Resistance of Individual Resistors be R1 and R2 ohms.
So, The Total Resistance in parallel combination will be (R1X R2)/(R1 plus R2) Ohms.
Here, R1 = 2 KOhm, and Total Resistance is 1.403 KOhm
Just Put this value of R1 in the following Equation to get R2.
(2R2)/ (2 Plus R2) = 1.403
Hence, R2 = 4.70 KOhm.

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BPSC Prelims Past Year Paper- 2021 - Question 3

On heating, the resistance of a semiconductor

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Increasing the temperature of intrinsic semiconductors provides more thermal energy for electrons to absorb and thus will increase the number of conduction electrons. This ultimately leads to a decrease in Resistance.

BPSC Prelims Past Year Paper- 2021 - Question 4

Faraday constant

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Faraday constant is universal constant, the value of Faraday constant (F) =96500 C mol−1

BPSC Prelims Past Year Paper- 2021 - Question 5

‘Light-year' is a unit of

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A light-year is the unit of distance.
1 Light Year≈ 9.461 trillion kilometers

BPSC Prelims Past Year Paper- 2021 - Question 6

Which of the following does not change when light travels from one medium to another? 

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The properties of light like wavelength, speed of light changes when it travels from one medium to another.

BPSC Prelims Past Year Paper- 2021 - Question 7

The velocity of electromagnetic waves is

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It is the same as the speed of light i.e. 3X108 m/s.

BPSC Prelims Past Year Paper- 2021 - Question 8

The first man who placed his foot on the moon is

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Apollo 11 was the spaceflight that first landed humans on the Moon in 1969.
Armstrong became the first person to step onto the lunar surface.

BPSC Prelims Past Year Paper- 2021 - Question 9

The number of neutrons in the nucleus of plutonium nuclide (94Pu242is

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The nucleus has two components i.e proton & neutron. The no. of protons is the atomic number.

BPSC Prelims Past Year Paper- 2021 - Question 10

The highest viscosity among the following is of

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Among the given options, Honey has the highest viscosity. It decreases with increase in temperature.

BPSC Prelims Past Year Paper- 2021 - Question 11

Milk is a poor source of

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Milk is rich in calcium, vitamin-D, proteins, phosphorus, magnesium, potassium, vitamin-B12, and Zinc. Carbohydrate is also present in little amount.

BPSC Prelims Past Year Paper- 2021 - Question 12

The breath test conducted by police to check drunken driver has which one of the following on the filter paper?

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When alcohol vapor makes contact with the yellow dichromate-coated crystals, the color changes from yellow to green. The degree of the color change is directly proportional to the degree of alcohol in the one’s breath.

BPSC Prelims Past Year Paper- 2021 - Question 13

Glucose is converted to ethyl alcohol by the enzyme

Detailed Solution for BPSC Prelims Past Year Paper- 2021 - Question 13

Zymase is an enzyme complex that acts as a catalyst during the fermentation of sugar into ethanol and carbon dioxide. It is found in yeasts. So, Glucose is converted into ethyl alcohol in the presence of Zymase.

BPSC Prelims Past Year Paper- 2021 - Question 14

Limewater is turned milky by

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When carbon dioxide (CO2) is passed through lime water CaCO3.H2O is formed.

BPSC Prelims Past Year Paper- 2021 - Question 15

The incomplete burning of petrol and diesel produces

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Any incomplete combustion produces carbon monoxide.

BPSC Prelims Past Year Paper- 2021 - Question 16

The pH of a solution changes from 3 to 6. The H+ ion concentration will

Detailed Solution for BPSC Prelims Past Year Paper- 2021 - Question 16

The concentration of hydrogen ions is inversely related to its pH and can be measured on the pH scale. Therefore, the more hydrogen ions present, the lower the pH; conversely, the fewer hydrogen ions, the higher the pH.
Initially pH = 3 so, [H ] = 10–3.
Now, pH = 6, so, [H ] = 10–6.
So, the concentration of Hydrogen Ion decreases by 1000 times.

BPSC Prelims Past Year Paper- 2021 - Question 17

A mixture of sand and naphthalene can be separated by

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Sublimation is the process of conversion of solid-state directly into the gaseous form, without even passing through the liquid phase.

BPSC Prelims Past Year Paper- 2021 - Question 18

The numbers of sigma and pi bonds in benzene are

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Benzene has molecular formula C6H6 (see the figure).
There is presence of a double bond in between alternate carbon atoms and each carbon is attached to two carbon atoms by means of a single bond and a double bond and a hydrogen atom by a single bond.

BPSC Prelims Past Year Paper- 2021 - Question 19

The elements present in urea are

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Urea‘s Formula is CH₄N₂O

BPSC Prelims Past Year Paper- 2021 - Question 20

The poorest conductor of heat among the following is

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At room temperature, mercury is a thick, silvery liquid with a very high density and low heat conductivity. It has a relatively high electrical conductivity.

BPSC Prelims Past Year Paper- 2021 - Question 21

The vitamin which is effective in blood clotting is

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Vitamin K helps to make various proteins that are needed for blood clotting and the building of bones.

BPSC Prelims Past Year Paper- 2021 - Question 22

The female sex hormone is 

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Hormones are natural substances produced in the body. They help to relay messages between cells and organs and affect many bodily functions.The two main female sex hormones are estrogen and progesterone. Although testosterone is considered a male hormone, females also produce it.

BPSC Prelims Past Year Paper- 2021 - Question 23

The Nobel Prize for developing treatment of Parkinson's disease was given to

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Carlsson’s research on the brain’s chemical signals and the resulting treatment for Parkinson’s disease earned him the 2000 Nobel Prize in Physiology or Medicine, which he shared with Paul Greengard and Eric R. Kandel.

BPSC Prelims Past Year Paper- 2021 - Question 24

The malfunctioning of thyroid gland is due to the deficiency of

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Iodine is used by the thyroid to produce hormones. Hypothyroidism results when the thyroid gland fails to produce enough hormones.

BPSC Prelims Past Year Paper- 2021 - Question 25

The sensitive area of the human tongue to bitterness is

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The bitterness can be tasted at the posterior part of the tongue which is one of four taste receptors of the tongue. It is located toward the back of the tongue.

BPSC Prelims Past Year Paper- 2021 - Question 26

Ginger is a stem and not root because

Detailed Solution for BPSC Prelims Past Year Paper- 2021 - Question 26

The ginger are considered as stems and not as roots as it contains nodes and internodes. They are known to lack chlorophyll. The nodes and internodes are able to grow into leaves or stalks of leaves.

BPSC Prelims Past Year Paper- 2021 - Question 27

The sweetest sugar among the following is

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Fructose is the sweetest carbohydrate sugar. It is found in fruits, honey etc. It is also called the fruit sugar.

BPSC Prelims Past Year Paper- 2021 - Question 28

Among the following, which is not a true fruit?

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Apple is not a true fruit. A fruit is always ripened ovary. Inside the apple fruit , the structure holding the seeds is actually the fruit while the edible fleshy part is actually the swollen wall material of ovary.

BPSC Prelims Past Year Paper- 2021 - Question 29

Legumes are highly nutritious because they are rich in

Detailed Solution for BPSC Prelims Past Year Paper- 2021 - Question 29

Legumes are rich in potassium, magnesium, and fiber, all nutrients that have a positive impact on blood pressure management.
Legumes are nutritionally valuable, providing proteins with essential amino acids, complex carbohydrates and dietary fibre .

BPSC Prelims Past Year Paper- 2021 - Question 30

Clove, a spice, is obtained from which part of the plant?

Detailed Solution for BPSC Prelims Past Year Paper- 2021 - Question 30

Cloves are the aromatic flower buds of a tree in the family Myrtaceae, Syzygium aromaticum. They are native to the Maluku Islands (or Moluccas) in Indonesia, and are commonly used as a spice.

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