ONLINE TPSC · READING MODE

Explore the question bank

Enable JavaScript for interactive practice, saved questions, and progress tracking.

Questions from the existing database. Please report any answers that need review.

Question 762

How much time the light from Sun takes to reach the Earth ?

A2 minutes

B4 minutes

C8 minutes

D12 minutes

Show answer

C. 8 minutesExplanation: Light from the Sun takes approximately 8 minutes and 20 seconds to reach the Earth. The average distance between the Earth and the Sun is about 149.6 million kilometers (1 Astronomical Unit). Since light travels at a speed of 3 × 108 meters per second in a vacuum, it covers this distance in roughly eight minutes. This means that when we see sunlight, we are actually seeing it as it was about eight minutes earlier.

Question 761

Which one is the hardest form of carbon ?

ACoke

BGraphite

CDiamond

DCharcoal

Show answer

C. DiamondExplanation: Diamond is the hardest natural form of carbon. In diamond, each carbon atom is covalently bonded to four other carbon atoms in a tetrahedral structure, forming a strong three-dimensional lattice. This arrangement makes diamond extremely hard, dense, and transparent. It is used in cutting, drilling, and polishing tools. In contrast, graphite (another allotrope of carbon) is soft and slippery because its carbon atoms are arranged in layers with weak forces between them.

Question 760

The gas used for artificial ripening of green fruit is:

AEthylene

BEthane

CCarbon dioxide

DNone of these

Show answer

A. EthyleneExplanation: The gas used for artificial ripening of green fruits is ethylene (C₂H₄). Ethylene is a natural plant hormone that regulates fruit ripening by stimulating the conversion of starches into sugars, making the fruit softer and sweeter. In artificial ripening, ethylene gas is introduced in controlled amounts to uniformly ripen fruits such as bananas, mangoes, and tomatoes. However, the use of harmful chemicals like calcium carbide for ripening is banned because it produces toxic substances like acetylene.

Question 759

Ozone hole refers to :

Ahole in Ozone layer

Bdecrease in the Ozone layer

Cdecrease in thickness of Ozone layer

Dincrease in thickness of Ozone layer

Show answer

C. decrease in thickness of Ozone layerExplanation: The term "Ozone hole" does not mean an actual hole but refers to a significant decrease in the thickness of the ozone layer in the Earth's stratosphere. This thinning occurs mainly over the Antarctic region during spring (September–November) due to chemical reactions involving chlorofluorocarbons (CFCs) and other ozone-depleting substances. These chemicals release chlorine and bromine atoms, which destroy ozone (O₃) molecules. The thinning allows more harmful ultraviolet (UV) radiation to reach the Earth's surface, causing health and environmental hazards.

Question 758

Mesons are found in

ALaser beam

BX-ray

CGamma rays

DCosmic rays

Show answer

D. Cosmic raysExplanation: Mesons are subatomic particles found in cosmic rays. They are unstable particles composed of one quark and one antiquark, making them part of the hadron family. Mesons are produced when high-energy cosmic rays from outer space collide with atoms in the Earth's atmosphere. These collisions generate a variety of secondary particles, including pions and kaons (types of mesons). Mesons have very short lifespans and quickly decay into other particles such as muons and neutrinos.

Question 757

Nuclear fission is caused by the impact of

ANeutron

BProton

CDeuteron

DElectron

Show answer

A. NeutronExplanation: Nuclear fission is the process in which the nucleus of a heavy atom, such as Uranium-235 or Plutonium-239, splits into two or more lighter nuclei when bombarded by a slow-moving neutron. This reaction releases a large amount of energy, along with additional neutrons that can trigger further fission reactions—leading to a chain reaction. This principle is used in nuclear reactors for power generation and in atomic bombs for explosive energy release.

Question 756

In Income Tax, Assessee is :

Aa person who pays income tax

Ba person who deducts income tax from its employees

Ca person who prepares income tax Return of tax payers

DNone of these

Show answer

A. a person who pays income taxExplanation not yet available.

Question 753

The lowest point, on land in the world is :

ADeath Valley, USA

BCaspian Sea, Russia

CDead Sea, Jordan/ Isarael

DLake Eyere, Australia

Show answer

C. Dead Sea, Jordan/ IsaraelExplanation not yet available.

Question 752

'Beans' is associated with computer programming language :

AC++

BJava

CCOBOL

DPASCAL

Show answer

B. JavaExplanation: In computer programming, the term "Beans" is specifically associated with the Java programming language. A JavaBean is a reusable software component written in Java that can be manipulated visually in a builder tool. JavaBeans follow certain conventions such as having a no-argument constructor, providing getter and setter methods, and being serializable. They are widely used in Enterprise Java applications for data encapsulation and to promote modular, reusable code.

Question 751

If the Cash Reserve Ratio (CRR) is lowered by the RBI, its impact on credit creation will be to :

Adecrease it

Bincrease it

CNo impact

DNone of these

Show answer

B. increase itExplanation not yet available.

Preparing your study space

Explore the question bank

How much time the light from Sun takes to reach the Earth ?

Which one is the hardest form of carbon ?

The gas used for artificial ripening of green fruit is:

Ozone hole refers to :

Mesons are found in

Nuclear fission is caused by the impact of

In Income Tax, Assessee is :

The lowest point, on land in the world is :

'Beans' is associated with computer programming language :

If the Cash Reserve Ratio (CRR) is lowered by the RBI, its impact on credit creation will be to :

You have a session in progress.

A useful place to practise.

Your progress belongs to you.