ONLINE TPSC · READING MODE

Science

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

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

Question 2315

Which among the following helps in circulation of blood ?

AErythrocytes

BBlood platelets

CMonocytes

DLymphocytes

Show answer

A. ErythrocytesExplanation: The erythrocytes (RBCs) play a crucial role in the circulation of blood by carrying oxygen from the lungs to body tissues and returning carbon dioxide for exhalation. They contain hemoglobin, which binds oxygen and maintains the red color of blood. Circulation itself is driven by the heart and supported by these oxygen-carrying cells.

Question 2220

Main constituents of biogas are:

AMethane and carbon monoxide

BButane and carbon monoxide

CMethane and carbon dioxide

DEthylene and carbon dioxide

Show answer

C. Methane and carbon dioxideExplanation: The main constituents of biogas are methane (CH₄) and carbon dioxide (CO₂). Biogas is produced through the anaerobic decomposition of organic matter such as animal dung and plant waste. Methane acts as the primary combustible component, making biogas an efficient and renewable source of energy.

Question 2218

The type of crop which is able to fix nitrogen from air is known as:

ALegume

BRice

CTuber

DPotato

Show answer

A. LegumeExplanation: Leguminous crops such as peas, beans, gram, and clover have a symbiotic relationship with Rhizobium bacteria in their root nodules. These bacteria convert atmospheric nitrogen into ammonia, enriching soil fertility naturally. Hence, legumes are used in crop rotation to restore nitrogen content in soil.

Question 2192

Which is the largest part of the human brain ?

AMedulla Oblongata

BCerebellum

CCerebellum

Dnone of them

Show answer

C. CerebellumExplanation: The Cerebrum forms about 80% of the total brain mass. It is divided into two hemispheres and is responsible for higher brain functions such as thought, action, reasoning, and emotion. The Cerebellum lies below it and controls coordination and balance, while the Medulla oblongata manages vital involuntary functions.

Question 2188

The growth of bacteria is measured by:

Ahemocytometer

Bspectrophotometer

Ccalorimeter

Dauxanometer

Show answer

B. spectrophotometerExplanation: The spectrophotometer measures bacterial growth by determining the optical density (OD) or turbidity of a culture. As bacteria multiply, the suspension becomes more turbid and absorbs more light. The absorbance value is proportional to the number of bacterial cells present.

Question 2120

The nearest planet to the sun is:

AVenus

BMars

CMercury

DJupiter

Show answer

C. MercuryExplanation: Mercury is the nearest planet to the Sun. It is the smallest planet in the solar system and completes one revolution around the Sun in just about 88 Earth days. Due to its proximity, Mercury experiences extreme temperature variations between day and night.

Question 2116

Montreal Protocol is related to:

AOzone depletion

BBio-diversity

CBiological weapons

DEuropean Community

Show answer

A. Ozone depletionExplanation: The Montreal Protocol, signed in 1987, is an international agreement aimed at protecting the ozone layer by phasing out the production and use of ozone-depleting substances (ODS) such as chlorofluorocarbons (CFCs) and halons. It is one of the most successful environmental treaties in history.

Question 2031

Time during which a job is processed by the computer is:

ADelay time

BReal time

CDown time

DExecution time

Show answer

D. Execution timeExplanation: Execution time is the period during which a job or program is actively processed by the computer’s CPU. It refers to the actual time taken to execute instructions, excluding waiting or idle times such as input/output delays or queue time.

Question 2030

Which of the following statements is not true about Bt cotton ?

ABt cotton has increased profit margin of farmers

BUse of insecticides has reduced significantly

CSeeds of Bt cotton are cheaper than non-GM seeds

DSince the use of Bt cotton India's cotton export has doubled.

Show answer

C. Seeds of Bt cotton are cheaper than non-GM seedsExplanation: Mucor is not a biofertilizer; it is a saprophytic fungus that grows on decaying organic matter. Biofertilizers are living microorganisms that enhance soil fertility by fixing atmospheric nitrogen or solubilizing nutrients. Examples include Rhizobium, Azotobacter, and Anabaena.

Question 2029

Which of the following is not a biofertilizer ?

ARhizobium

BMucor

CAzotobacter

DAnabaena

Show answer

B. MucorExplanation: Mucor is not a biofertilizer; it is a saprophytic fungus that grows on decaying organic matter. Biofertilizers are living microorganisms that enhance soil fertility by fixing atmospheric nitrogen or solubilizing nutrients. Examples include Rhizobium, Azotobacter, and Anabaena.

Preparing your study space

Science

Which among the following helps in circulation of blood ?

Main constituents of biogas are:

The type of crop which is able to fix nitrogen from air is known as:

Which is the largest part of the human brain ?

The growth of bacteria is measured by:

The nearest planet to the sun is:

Montreal Protocol is related to:

Time during which a job is processed by the computer is:

Which of the following statements is not true about Bt cotton ?

Which of the following is not a biofertilizer ?

You have a session in progress.

A useful place to practise.

Your progress belongs to you.