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Question 1347

The moon takes __________ days to go round the earth once.

A28 days

B45 days

C50 days

D65 days

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A. 28 daysThe Moon takes about 27.3 days to complete one revolution around the Earth with respect to the stars (called the sidereal month). However, due to the simultaneous movement of the Earth around the Sun, the Moon takes approximately 29.5 days to complete one full cycle of phases (from new moon to new moon), known as the synodic month. This period is commonly rounded to 28 days in general usage. Other options (for context) 45 days: Much longer than the Moon’s actual orbital period. 50 days: Incorrect — the Moon completes more than one revolution in this time. 65 days: Far too long compared to the real lunar cycle.

Question 1346

The highest tides occur at the time of the new moon and the:

Afull moon

Bsolar eclipse

Clunar eclipse

Dvolcanoes

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A. full moonThe highest tides, known as spring tides, occur during the time of the new moon and the full moon. During these phases, the Sun, Moon, and Earth are aligned in a straight line, causing their combined gravitational forces to produce higher high tides and lower low tides. This alignment amplifies the tidal effect, resulting in the strongest tidal ranges. Other options (for context) Solar eclipse: Can coincide with a new moon but is not directly responsible for higher tides. Lunar eclipse: Occurs during a full moon but does not always produce exceptionally high tides. Volcanoes: Have no relation to tidal movements; tides are caused by gravitational forces, not geological activity.

Question 1345

Which of the following is a fossil fuel?

ACoal

BSolar energy

CQuartz

DLava

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A. CoalCoal is a fossil fuel formed from the remains of plants that lived and died millions of years ago. Over long geological periods, heat and pressure converted these plant remains buried under soil and rock into coal. It is a major source of energy used for electricity generation, steel production, and various industrial processes. However, burning coal releases carbon dioxide, contributing to air pollution and global warming. Other options (for context) Solar energy: A renewable energy source derived from sunlight, not a fossil fuel. Quartz: A mineral composed of silicon and oxygen, not an energy source. Lava: Molten rock from volcanic eruptions, not a fossil fuel.

Question 1344

Which layer of gas in the atmosphere protects us from harmful ultra violet rays of the sun?

AOxygen

BCarbon dioxide

CNitrogen

DOzone

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D. OzoneThe Ozone layer in the Earth’s stratosphere protects living organisms from the Sun’s harmful ultraviolet (UV) rays. Ozone (O₃) absorbs most of the high-energy UV radiation, preventing it from reaching the Earth’s surface, where it could cause skin cancer, cataracts, and damage to plants and marine ecosystems. This protective layer is mainly found between 10 to 50 km above the Earth’s surface. Other options (for context) Oxygen: Essential for respiration but does not block UV rays. Carbon dioxide: A greenhouse gas responsible for trapping heat, not UV protection. Nitrogen: Makes up most of the atmosphere but plays no role in UV absorption.

Question 1308

Which of the following is a vector?

AMass

BVolume

CSpeed

DVelocity

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D. VelocityVelocity is a vector quantity because it has both magnitude and direction. It represents the rate of change of displacement of an object. Unlike speed, which only tells how fast an object is moving, velocity also indicates the direction of motion. Other options (for context) Mass: A scalar quantity — it has magnitude only, no direction. Volume: Scalar — represents space occupied by matter, without direction. Speed: Scalar — measures how fast an object moves but not in which direction.

Question 1307

Oxygen is transported to the cells of the human body through:

ARed Blood cells

BWhite Blood cells

CHormones

DEnzymes

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A. Red Blood cellsOxygen is transported to the body’s cells by Red Blood Cells (RBCs). RBCs contain a special iron-containing pigment called hemoglobin, which has the ability to bind oxygen in the lungs and release it in body tissues where it is needed for cellular respiration. This process ensures that all body cells receive the oxygen required to produce energy (ATP). Other options (for context) White Blood Cells (WBCs): Defend the body against infections and diseases, but do not carry oxygen. Hormones: Chemical messengers that regulate body functions, not involved in oxygen transport. Enzymes: Biological catalysts that speed up chemical reactions, not oxygen carriers.

Question 1306

Which of the following is a source of non-conventional energy?

AFirewood

BDiesel

CPetrol

DBiogas

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D. BiogasBiogas is a source of non-conventional (renewable) energy. It is produced through the anaerobic decomposition of organic waste materials such as animal dung, crop residues, and kitchen waste. Biogas mainly contains methane (CH₄) and is used as a clean fuel for cooking, lighting, and even power generation. It helps reduce dependence on fossil fuels and minimizes environmental pollution. Other options (for context) Firewood: A traditional biomass fuel, not classified as a modern non-conventional source. Diesel: A conventional fossil fuel derived from crude oil. Petrol: Another conventional fossil fuel obtained from petroleum refining.

Question 1221

Red blood corpuscles are formed in:

AHeart

BBone marrow

CLiver

DKidney

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B. Bone marrowRed Blood Corpuscles (RBCs), also known as erythrocytes, are formed in the bone marrow. Specifically, they are produced in the red bone marrow of large bones through a process called erythropoiesis. The hormone erythropoietin, secreted mainly by the kidneys, regulates this process. Mature RBCs are responsible for transporting oxygen from the lungs to body tissues using the pigment hemoglobin. Other options (for context) Heart: Pumps blood but does not produce blood cells. Liver: In adults, it does not form RBCs (though it does in the fetal stage). Kidney: Produces erythropoietin hormone but not RBCs directly.

Question 1217

Aryabhatta was a famous ________ of ancient India.

ADoctor

BPoet

CPhysicist

DMathematician

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D. MathematicianAryabhatta was a renowned mathematician and astronomer of ancient India. He lived during the Gupta period (around 476–550 CE) and authored the famous work Aryabhatiya. Aryabhatta introduced the concept of zero (0) and explained the place value system. He also proposed that the Earth rotates on its axis and correctly explained solar and lunar eclipses. Other options (for context) Doctor: No historical evidence of Aryabhatta being a physician. Poet: Although his works were written in verse form, his main field was mathematics and astronomy. Physicist: The term did not exist in his time; however, his scientific thinking laid foundations for later studies.

Question 1213

Which disease is caused by Nickel ?

AItai Itai

BDermatitis

CLearning Disability

DAsthma

Show answer

B. DermatitisNickel exposure commonly causes a skin disease called Dermatitis, specifically Allergic Contact Dermatitis. This condition occurs when the skin comes into direct contact with nickel-containing objects such as jewelry, coins, or belt buckles. It leads to redness, itching, and rashes, especially in sensitive individuals. Nickel allergy is one of the most common metal allergies worldwide. Other options (for context) Itai Itai: Caused by cadmium poisoning, not nickel. Learning Disability: Not directly linked to nickel exposure. Asthma: May be aggravated by pollutants, but not typically caused by nickel.

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Science

The moon takes __________ days to go round the earth once.

The highest tides occur at the time of the new moon and the:

Which of the following is a fossil fuel?

Which layer of gas in the atmosphere protects us from harmful ultra violet rays of the sun?

Which of the following is a vector?

Oxygen is transported to the cells of the human body through:

Which of the following is a source of non-conventional energy?

Red blood corpuscles are formed in:

Aryabhatta was a famous ________ of ancient India.

Which disease is caused by Nickel ?

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