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Question 954

Which of the following elements is essential for the transmission of nerve impulses in nerve fibers of human body ?

ACalcium

BIron

CSodium

DZinc

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C. SodiumExplanation: Sodium (Na⁺) plays a crucial role in the transmission of nerve impulses in the human body. Nerve cells (neurons) transmit signals through an electrochemical process known as the nerve impulse or action potential. During this process, the movement of sodium (Na⁺) and potassium (K⁺) ions across the nerve cell membrane generates an electrical charge. The rapid influx of sodium ions causes depolarization, which allows the nerve impulse to travel along the neuron, ensuring proper communication between the brain, spinal cord, and body.

Question 953

All enzymes are actually

AProtein

BCarbohydrates

CFatty acids

DSteroids

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A. ProteinExplanation: All enzymes are proteins (except a few RNA-based enzymes called ribozymes). Enzymes act as biological catalysts that speed up chemical reactions in living organisms without being consumed in the process. They work by lowering the activation energy of reactions, ensuring that metabolic processes occur efficiently at normal body temperatures. Each enzyme is specific to a particular substrate, forming an enzyme-substrate complex to carry out its function effectively.

Question 952

The largest gland of human body is :

AThyroid

BKidney

CPancreas

DLiver

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D. LiverExplanation: The liver is the largest gland in the human body. It is located in the upper right part of the abdomen, just below the diaphragm. The liver performs multiple vital functions, including the secretion of bile (which helps in digestion of fats), detoxification of harmful substances, storage of glycogen (energy reserve), and the synthesis of proteins and cholesterol. It also plays a crucial role in regulating blood sugar levels and metabolism. The average adult human liver weighs about 1.2 to 1.5 kilograms.

Question 951

Growth hormone is produced by :

ABones

BPituitary gland

CThyroid gland

DAdrenal gland

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B. Pituitary glandExplanation: The Growth Hormone (GH), also known as Somatotropin, is secreted by the anterior lobe of the pituitary gland, which is located at the base of the brain. This hormone stimulates growth, cell reproduction, and regeneration in humans and other animals. It plays a vital role in increasing height during childhood and adolescence, regulating metabolism, and maintaining muscle and bone mass. A deficiency of GH causes dwarfism in children, while excess secretion leads to gigantism or acromegaly.

Question 950

Bronchitis is a disease of :

ABlood

BLiver

CIntenstine

DRespiratory track

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D. Respiratory trackExplanation: Bronchitis is an inflammation of the bronchial tubes, which are the air passages of the respiratory tract that carry air to and from the lungs. The condition causes coughing, mucus production, chest discomfort, and difficulty in breathing. It can be caused by viral or bacterial infections, long-term exposure to smoke, dust, or air pollutants. Chronic bronchitis is a serious form often associated with smoking and is part of a group of lung diseases known as COPD (Chronic Obstructive Pulmonary Disease).

Question 949

Which of the following adds/add carbon dioxide to the carbon cycle on the planet earth ? 1. Volcanic action 2. Respiration 3. Photosynthesis 4. Decay of organic matter (Select correct answer)

A1, 2 and 4 only

B1 and 3 only

C2 only

D1, 2 and 3 only

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A. 1, 2 and 4 onlyExplanation: The processes that add carbon dioxide (CO₂) to the carbon cycle on Earth are: 1. Volcanic action: Volcanic eruptions release large amounts of CO₂ and other gases from the Earth’s interior into the atmosphere. 2. Respiration: All living organisms release CO₂ as a by-product of breaking down glucose during cellular respiration. 4. Decay of organic matter: Decomposition of dead plants and animals by microbes produces CO₂ and methane (CH₄). Photosynthesis (option 3), on the other hand, removes CO₂ from the atmosphere as plants use it to produce glucose and release oxygen.

Question 948

Which of the following is an operating system ?

AFloppy

BWindows Xp

COracle

DROM

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B. Windows XpExplanation: Windows XP is an operating system (OS) developed by Microsoft. An operating system is system software that manages computer hardware, software resources, and provides services for running application programs. Windows XP, released in 2001, was one of the most popular OS versions used for both personal and business computers. It provides a graphical user interface (GUI), multitasking, and file management capabilities.

Question 947

Which of the following is used to express the speed of internet connectivity ?

AMb / sec

BMb

CHerz

DKb

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A. Mb / secExplanation: The speed of internet connectivity is expressed in Megabits per second (Mb/sec or Mbps). It indicates how much data is transferred per second over a network connection. One megabit equals 1,000,000 bits. Higher Mbps values mean faster internet speeds. For example, a 100 Mbps connection can transfer 100 million bits of data every second. Note that 1 byte = 8 bits, so internet speeds in Mbps differ from file sizes, which are usually measured in megabytes (MB).

Question 946

A transformer is used to :

AIncrease or decrease D.C voltage

BIncrease or decrease A.C voltage

CConvert A.C to D.C

DConvert D.C into A.C

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B. Increase or decrease A.C voltageExplanation: A transformer is an electrical device used to increase (step-up) or decrease (step-down) the voltage of alternating current (A.C.). It works on the principle of electromagnetic induction and functions only with A.C., not with D.C. A transformer consists of two coils—primary and secondary—wound around a soft iron core. The voltage ratio between these coils depends on the number of turns in each winding. Transformers are used in power transmission, distribution, and electronic devices to regulate voltage levels efficiently.

Question 943

Where is 'Dakshin Gangotri' located ?

ASouth Pole

BHimalaya

CUttarakhand

DAntarctica

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D. AntarcticaExplanation: Dakshin Gangotri is India’s first scientific research station established in Antarctica in 1983–84. It was set up by the Indian Antarctic Programme under the National Centre for Polar and Ocean Research (NCPOR). Located about 2,500 km from the South Pole, it served as a base for scientific studies related to glaciology, meteorology, and environmental sciences. Though it is now buried under ice and functions as a supply base, it marked India’s permanent presence in Antarctica. Later stations include Maitri (1989) and Bharati (2012).

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Science

Which of the following elements is essential for the transmission of nerve impulses in nerve fibers of human body ?

All enzymes are actually

The largest gland of human body is :

Growth hormone is produced by :

Bronchitis is a disease of :

Which of the following adds/add carbon dioxide to the carbon cycle on the planet earth ? 1. Volcanic action 2. Respiration 3. Photosynthesis 4. Decay of organic matter (Select correct answer)

Which of the following is an operating system ?

Which of the following is used to express the speed of internet connectivity ?

A transformer is used to :

Where is 'Dakshin Gangotri' located ?

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