Q: Average distance of the earth from the Sun is:

A: 150 Million km

B: 15 Million km

C: 90 Million km

D: 900 Million km



Correct Option: A  [ 150 Million km ]

Remark:

The average distance between the Earth and the Sun is approximately 150 million kilometers (or about 1 Astronomical Unit – 1 AU). This distance serves as a standard unit of measurement for describing distances within our solar system. Despite slight variations due to Earth's elliptical orbit, this average remains nearly constant and is crucial for maintaining suitable conditions for life on Earth.

Other options (for context)

  • 15 Million km: Far too close — the Earth would be extremely hot and uninhabitable.
  • 90 Million km: Shorter than the actual average distance.
  • 900 Million km: Much greater — about six times the real distance, closer to Saturn’s orbit.


Q: The salinity of the sea water is:

A: 1.5 %

B: 2.5 %

C: 3.5 %

D: 4.5 %



Correct Option: C  [ 3.5 % ]

Remark:


Q: Which of the following is an example of static electricity ?

A: Glass rod rubbed with silk cloth

B: Ebonite rod rubbed with wool

C: Lightening in the sky

D: All of the above



Correct Option: D  [ All of the above ]

Remark:

All of the above are examples of static electricity. Static electricity is the result of the accumulation of electric charges on the surface of objects. When materials like glass, silk, ebonite, or wool are rubbed together, electrons are transferred, creating a charge imbalance. Similarly, lightning is a large-scale natural discharge of static electricity between clouds and the Earth.

  • Glass rod & silk cloth: Positive and negative charges develop.
  • Ebonite rod & wool: Negative charge accumulates on ebonite.
  • Lightning: Discharge of atmospheric static electricity.


Q: The process in which living organisms are used to remove contaminants, pollution or other unwanted substances from soil or water is known as:

A: Biotechnology

B: bioremediation

C: Biodegradation

D: Biomagnification



Correct Option: B  [ bioremediation ]

Remark:

Bioremediation is the process by which living organisms — mainly microbes, fungi, or plants — are used to remove or neutralize contaminants, pollutants, or toxins from soil, water, or air. These organisms break down harmful substances into less toxic or non-toxic forms, helping to clean up polluted environments naturally. It is an eco-friendly and cost-effective method for environmental restoration.

Other options (for context)

  • Biotechnology: A broader field involving the use of living systems for industrial, agricultural, or medical purposes.
  • Biodegradation: The natural breakdown of organic materials by microorganisms, but not necessarily aimed at pollution cleanup.
  • Biomagnification: The accumulation of toxic substances in the food chain, opposite of pollution removal.


Q: What is the name of first Indian Artificial satellite?

A: Apollo

B: Rohini

C: Bhaskara

D: Aryabhatta



Correct Option: D  [ Aryabhatta ]

Remark:
launched by the Soviet Union on 19 April 1975 and built by the Indian Space Research Organisation (ISRO)


Q: The red planet is

A: Venus

B: Saturn

C: Mars

D: Neptune



Correct Option: C  [ Mars ]

Remark:

Explanation: Mars is known as the Red Planet because its surface contains a large amount of iron oxide (rust), which gives it a reddish appearance. It is the fourth planet from the Sun and has two moons — Phobos and Deimos.


Q: Magnification produced by a rear view mirror fitted in vehicles:

A: is less than the object

B: is more than the object

C: is equal to the object

D: can be more or less than the object depending upon the position of object in front of it.



Correct Option: A  [ is less than the object ]

Remark:

Explanation: Acids do not turn red litmus to blue; they turn blue litmus paper red. Acids are sour in taste, corrosive in nature, and have a pH value less than 7. The statement that acids turn red litmus to blue is incorrect.


Q: India's first atomic power station was set up at:

A: Surat (Gujarat)

B: Tarapur (Maharashtra)

C: Trombay (Maharashtra)

D: Trombay (Maharashtra)



Correct Option: B  [ Tarapur (Maharashtra) ]

Remark:


Q: Insulin is secreted by :

A: Pancreas

B: Liver

C: Gall Bladder

D: Kidney



Correct Option: A  [ Pancreas ]

Remark:

Explanation: Insulin is a hormone secreted by the beta (β) cells of the Islets of Langerhans in the pancreas. Its main function is to regulate the blood glucose level by promoting the uptake of glucose into cells and converting excess glucose into glycogen in the liver and muscles. A deficiency or lack of insulin causes diabetes mellitus, leading to high blood sugar levels. The pancreas also secretes glucagon, which performs the opposite function by increasing blood glucose levels.


Q: The acceleration due to gravity at the equator:

A: is less than that at the poles

B: is greater than that at the poles

C: is equal to that at the poles

D: does not depend on the earth's centripetal acceleration



Correct Option: A  [ is less than that at the poles ]

Remark:
1...