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28 Sep 2021: The Hindu Analysis

UPSC Current Affairs Preparation: The Hindu Analysis Watch expert analysis of ‘The Hindu’ dated 28th Sep 2021. Important news and views to boost... View Article

AIR Spotlight – New Energy and Extension to Panchayats and Co-operative Societies

AIR Spotlight is an insightful program featured daily on the All India Radio Newsonair. In this program, many eminent panellists discuss issues... View Article

IAS Topper 2020 [AIR 3] – Ankita Jain

Ankita Jain born in Agra and brought up in Delhi has secured All India Rank 3 in the UPSC Civil Services Examination 2020. She was able to top... View Article

Write the main difference between acid and a base. With the help of suitable examples, explain the terms neutralization and the formation of i.Acidic ii.Basic iii.Neutral salts

Basis Acid Base Arrhenius concept An acid is a substance that produces H+H+ ions as the only positive ions when mixed with water. A base is... View Article

How will the strength the magnetic field change when the point where the magnetic field is to be determined is moved away from the straight wire carrying constant current? Justify your answer.

When we move away from the compass needle from the straight wire, the deflection of the needle decreases which implies the strength of the... View Article

Draw the pattern of magnetic field lines produced around a current-carrying straight conductor passing perpendicularly through a cardboard. Name, state and apply the rule to mark the direction of these field lines.

To mark the direction of magnetic field lines, we will use the Right-hand thumb rule. According to this rule, if we hold the current-carrying... View Article

Metals like calcium and magnesium are never found in their free state in the nature

Metals tend to lose electrons. So, their reactivity is compared on the basis of electron-donating power. Ongoing left to right in the periodic... View Article

Explain the follwoing. Reactivity of aluminium decrease if it is dipped in nitric acid.

The reactivity of aluminium decreases if it is dipped in nitric acid because nitric acid is a strong oxidising agent. As a result, when aluminium... View Article

Explain the following: Sodium chloride is an ionic compound which does not conduct electricity in solid state whereas it does conduct electricity in molten state as well as in aqueous solution.

Sodium chloride is an ionic compound having sodium and chloride ions in its structure. Ionic compounds do not conduct electricity in solid state... View Article

List three advantages each of: (i) exploiting resources with short term aims, and (ii) using a long term perspective in managing our natural resources.

(i) It fulfils the requirements of the present generation only. It provides industrial growth. It improves the lifestyle of people. (ii)... View Article

List two different functions performed by pancreas in our body.

The pancreas is a mixed organ located in the back of the belly in the abdomen. The pancreas is called a mixed gland because it exerts endocrine... View Article

What would you suggest to a student if while performing an experiment he finds that the pointer/needle of the ammeter and voltmeter do not coincide with the zero marks on the scales when the circuit is open? No extra ammeter/voltmeter is available in the laboratory.

Now first you need to get the least count of both meters. Then add as many least counts as needed to add up to the point where the needle... View Article

What happens to the image distance in the normal human eye when we decrease the distance of an object, say 10 m to 1 m? Justify your answer.

When we decrease the distance of an object from 10 m to 1 m, our eye changes its focal length to focus the image on the retina itself. So, when... View Article

In the experimental set up to show that “CO2 is given out during respiration”, name the substance taken in the small test tube kept in the conical flask. State its function and the consequence of its use.

For the experiment where CO2 is given out during respiration, KOH solution or pallets are taken in a test tube and placed in the conical flask... View Article

What is a solenoid? Draw the pattern of magnetic field lines of (i) A current carrying solenoid and (ii)A bar magnet. List two distinguishing features between the two fields.

It is coil containing many circular terns, there wire are wrapped closely in the shape of a cylinder and it is used as an electromagnet. It also... View Article

An object is placed at a distance of 30 cm from a concave lens of focal length 30 cm. i. Use lens formula to determine the distance of the image from the lens. ii. List four characteristics of the image (nature, position, size, erect/inverted) in this case. iii. Draw a well labelled diagram to justify your answer part (ii)

Lens Formula: 1/f = 1/v − 1/u where f is the focal length of the concave lens, v is the image distance from optical center, u is the... View Article

What are alloys? List two properties of alloys.

An alloy is homogeneous substance obtained when a metal is mixed with another element, which may be a metal or a non-metal. Some commercially... View Article

Write chemical equation for the following reactions: a.) Calcium metal reacts with water. b.) Cinnabar is heated in the presence of air. c.) Manganese dioxide is heated with aluminium powder.

i. Calcium metal reacts with water. We know that chemical representation of calcium is Ca Water is the common name used for the compound with... View Article

Write the chemical formula and name of the compound which is the active ingredient of all alcoholic drinks. List its two uses. Write chemical equation and name of the product formed when this compound reacts with- (i) Sodium metal (ii) Hot concentrated sulphuric acid

The active ingredient found in all alcoholic beverages is Ethanol. It is also commonly referred to as ethyl alcohol, pure alcohol, grain alcohol... View Article

What is the feedback mechanism of hormone regulation? Take the example of insulin to explain this phenomenon.

The hormone feedback mechanism is defined as the mechanism that is used to maintain the hormone balance in the blood / body. The increase or... View Article

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