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Question 2727

What is the main property of mercury for using it in a clinical thermometer?

AGood conductor of heat

BHigh density

CGood conductor of electricity

DEasily available

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A. Good conductor of heatExplanation: Mercury is used in clinical thermometers mainly because it is a good conductor of heat, allowing it to quickly reach the temperature of the patient’s body. Additionally, it has a uniform rate of expansion, remains liquid over a wide temperature range, and has a shiny appearance for easy visibility of the reading.

Question 2726

The Kala-azar disease in man is spread by the bite of a:

ACulex Mosquito

BPhlebotomus sandfly

CClimex bed-bug

DSarcoptes mites

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B. Phlebotomus sandflyExplanation: Kala-azar, also known as visceral leishmaniasis, is caused by the protozoan parasite Leishmania donovani. It is transmitted through the bite of the female Phlebotomus sandfly. The disease primarily affects the liver, spleen, and bone marrow, leading to symptoms such as fever, anemia, weight loss, and darkening of the skin. The term “Kala-azar” literally means “black fever.”

Question 2682

LCD stands for

ALiquid Crystal Display

BLow Current Display

CLight Circuit Display

DNone of the above

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A. Liquid Crystal DisplayExplanation: LCD stands for Liquid Crystal Display. It is a flat-panel display technology commonly used in televisions, computer monitors, calculators, and smartphones. LCDs use liquid crystals that modulate light to produce images when an electric current is applied.

Question 2679

Sound waves in air are

ATransverse

BLongitudinal

CElectromagnetic

DPolarized

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B. LongitudinalExplanation: Sound waves in air are longitudinal waves, meaning the particles of the medium vibrate back and forth in the same direction as the wave travels. These waves require a material medium (like air, water, or solids) for propagation and cannot travel through a vacuum.

Question 2678

RADAR is used for

Alocating submerged submarines

Breceiving signals in a radio receiver

Clocating geostationary satellites

Ddetecting and locating the position of objects such as aeroplane

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D. detecting and locating the position of objects such as aeroplaneExplanation not yet available.

Question 2674

Which of the rays is most dangerous ?

AAlpha ray

BBeta ray

CGama ray

DX-ray

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C. Gama rayExplanation: Gamma rays are the most dangerous type of radiation because they have very high energy and strong penetrating power. They can pass through most materials, including human tissue, and may cause serious cellular and genetic damage. Proper shielding with dense materials like lead is required for protection.

Question 2646

The longest cell in animals is

ANerve cell

BHepatocyte (Liver cell)

CBlood cell

DMuscle cell

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A. Nerve cellExplanation: The nerve cell or neuron is the longest cell in animals. It consists of a cell body, dendrites, and a long fiber called the axon. In humans, the axon of a motor neuron can be over 1 meter long (from the spinal cord to the toes). This structure helps transmit electrical impulses rapidly across the body, allowing coordination and communication between organs.

Question 2640

The digested food is absorbed in

AStomach

BIntestine (small)

CIntestine (large)

DColon

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B. Intestine (small)Explanation: The small intestine is the primary site of absorption of digested food. Its inner lining has numerous tiny finger-like projections called villi and microvilli that greatly increase the surface area for absorption. Nutrients such as glucose, amino acids, fatty acids, vitamins, and minerals pass into the blood and lymph through these structures. The large intestine mainly absorbs water and fo

Question 2638

Compound microscope has

Atwo lenses

Brequires UV light source

Cused to view only dead organisms

Drequires large room space

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A. two lensesExplanation not yet available.

Question 2624

Chiropterochory is a seed dispersal process through

ABirds

BBats

CReptiles

DInsects

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B. BatsExplanation: Chiropterochory comes from the Greek words “chiroptera” (bats) and “chorein” (to spread). It refers to the dispersal of seeds by fruit bats or flying foxes, which feed on fruits and later excrete or drop the seeds away from the parent plant. This process helps in plant reproduction and maintaining forest diversity. Common examples include dispersal of seeds of guava, fig, and

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Science

What is the main property of mercury for using it in a clinical thermometer?

The Kala-azar disease in man is spread by the bite of a:

LCD stands for

Sound waves in air are

RADAR is used for

Which of the rays is most dangerous ?

The longest cell in animals is

The digested food is absorbed in

Compound microscope has

Chiropterochory is a seed dispersal process through

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