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

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.

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.

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.

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

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

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

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

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.

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

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

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

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.

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.

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

Any incomplete combustion produces carbon monoxide.

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.

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

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.

Urea‘s Formula is CH₄N₂O

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.

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

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.

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.

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

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.

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.

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

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.

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 .

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.