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Question 3108

Shadows are formed when a __________ object comes in the path of light.

AOpaque

BTransparent

CLuminous

DTranslucent

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A. OpaqueExplanation: Shadows are formed when an opaque object comes in the path of light. Opaque objects do not allow light to pass through them, causing a dark region called a shadow to form on the opposite side. Transparent and translucent objects allow light to pass fully or partially, so they form faint or no shadows.

Question 3106

What is the frequency range of audible waves?

A20 to 20000 Hz

B21000–24000 Hz

C25000–30000 Hz

D31000–40000 Hz

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A. 20 to 20000 HzExplanation: The audible range of sound refers to the frequencies that can be detected by the average human ear, typically from 20 Hz to 20,000 Hz (20 kHz). Sounds below 20 Hz are called infrasonic and those above 20,000 Hz are called ultrasonic. Hearing sensitivity decreases with age, and most adults can hear up to about 16,000 Hz.

Question 3105

Which of the following is the structural and functional unit of kidneys?

ANephron

BPits

CNutrofil

DTentacle

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A. NephronExplanation: The nephron is the basic structural and functional unit of the kidney. Each human kidney contains about 1 to 1.5 million nephrons. A nephron consists of two main parts — the renal corpuscle (Bowman's capsule and glomerulus) and the renal tubule. It performs three main functions: filtration of blood, reabsorption of essential substances, and secretion

Question 3046

Entomology is the science that studies:

AThe origin and history of technical and scientific terms.

BInsects

CThe formation of Rocks

DBehavoiur of human beings

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B. InsectsExplanation: Entomology is a branch of Zoology that focuses on the study of insects, including their structure, classification, behavior, ecology, and evolution. Insects make up more than 75% of all known animal species on Earth and play crucial roles in pollination, decomposition, and food chains. Scientists who study insects are known as entomologists.

Question 3041

Fathom is unit of:

ADepth

BDistance

CFrequency

DSound

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A. DepthExplanation: Fathom is a unit used to measure depth, particularly the depth of water in oceans and seas. One fathom is equal to 6 feet or approximately 1.83 meters. It is commonly used in navigation and marine studies.

Question 3038

Neutron was discovered by:

AJ. Chadwick

BJ. J. Thomson

CRutherford

DNeil Bohr

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A. J. ChadwickExplanation: Neutron was discovered by James Chadwick in 1932. He identified the neutron as a neutral subatomic particle present in the nucleus of an atom, having a mass nearly equal to that of a proton but no electrical charge.

Question 3037

The ingredient that assists clotting of blood is:

AVitamin A

BFolic acid

CVitamin D

DVitamin K

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D. Vitamin KExplanation: Vitamin K plays a crucial role in the blood clotting process. It helps the liver synthesize prothrombin and other clotting factors required to stop bleeding when injuries occur. Deficiency of Vitamin K can lead to excessive bleeding and delayed clot formation. Green leafy vegetables, broccoli, spinach, and intestinal bacteria are major natural sources of this vitamin.

Question 3033

Which one of the following is not an electromagnetic wave?

ARadio wave

BX-ray

CVisible light

DSound wave

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D. Sound waveExplanation: Sound waves are not electromagnetic waves; they are mechanical waves that require a material medium (like air, water, or solids) for propagation. In contrast, radio waves, X-rays, and visible light are electromagnetic waves that can travel through a vacuum.

Question 2953

Brass gets discoloured in air due to constant exposure in presence of:

AAluminium sulphide

BAluminium phosphide

CHydrogen sulphide

DHydrogenated wafers

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C. Hydrogen sulphideExplanation: Brass, an alloy of copper and zinc, gets discoloured when exposed to air containing hydrogen sulphide (H₂S). The H₂S reacts with the metal surface to form a dark layer of metal sulphides (mainly copper sulphide), causing tarnishing and loss of shine.

Question 2952

The primary producer in an ecosystem are:

ABacteria

BWomen

CMen

DPlants

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D. PlantsExplanation: In any ecosystem, green plants (and some algae and cyanobacteria) act as primary producers. They convert solar energy into chemical energy through the process of photosynthesis, producing glucose and oxygen. This stored energy becomes the foundation of all food chains, supporting consumers and decomposers. Thus, plants form the first trophic level in an

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Science

Shadows are formed when a __________ object comes in the path of light.

What is the frequency range of audible waves?

Which of the following is the structural and functional unit of kidneys?

Entomology is the science that studies:

Fathom is unit of:

Neutron was discovered by:

The ingredient that assists clotting of blood is:

Which one of the following is not an electromagnetic wave?

Brass gets discoloured in air due to constant exposure in presence of:

The primary producer in an ecosystem are:

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