NEET questions with solutions

Q1. An anti-forest measure is

1. Afforestation
2. Selective grazing
3. Clearing forest
4. Selective felling

Answer: Clearing forest

Clearing forest directly removes trees and vegetation, which is counter to preserving or maintaining forests.

Q2. Among the following organic acids, the acid present in rancid butter is:

1. pyruvic acid
2. lactic acid
3. butyric acid
4. acetic acid

Answer: butyric acid

Butyric acid is a short-chain fatty acid responsible for the unpleasant smell of rancid butter due to its breakdown in fats.

Q3. Which of the following statement regarding transformer is incorrect?

1. A transformer makes use of Faradays Law.
2. The ferromagnetic properties of an iron core is used by it to efficiently raise or lower AC voltage
3. It cannot increase power so that if the voltage is raised, the current is proportionally lowered and vice versa.
4. The current induced in primary circuit is of same nature as in secondary circuit with differences in amplitude only.

Answer: The current induced in primary circuit is of same nature as in secondary circuit with differences in amplitude only.

The current in the primary and secondary circuits of a transformer differs not only in amplitude but also in phase, making the statement incorrect.

Q4. Fern plants reproduce by

1. Seeds
2. Spores
3. Laying eggs
4. Giving birth to young fern plants

Answer: Spores

Ferns reproduce via spores, which are small reproductive units that grow into new plants under suitable conditions.

Q5. Electric current flows through:

1. a conductor
2. an insulator
3. free space
4. none of these

Answer: a conductor

Electric current flows through a conductor because it allows free movement of electrons, unlike insulators or free space.

Q6. A particle of mass \( m \) is made to move with uniform speed \( v \) along the perimeter of a regular hexagon. The magnitude of impulse applied at each corner is:

1. \( m v \)
2. \( m v \sqrt{3} \)
3. \( \frac{m v}{2} \)
4. \( \frac{m v}{\sqrt{3}} \)

Answer: \( m v \)

At each corner, the velocity direction changes by 120°, causing a change in momentum. Impulse equals this change, which is proportional to mv.

Q7. A ketone has molar mass \( 86 . \) Which of the following cannot be IUPAC name of this ketone?

1. 2 -pentanone
2. 2-methyl butanone
3. 3 -methyl butanone
4. 3 -pentanone

Answer: 3 -methyl butanone

The molar mass of 3-methyl butanone exceeds 86, so it cannot be the correct IUPAC name for the ketone.

Q8. An ideal gas is compressed in a closed container its U?

1. Increases
2. Decreases
3. Remains same
4. Both (1) \& (2)

Answer: Increases

For an ideal gas, internal energy (U) depends only on temperature. Compression raises temperature, so U increases.

Q9. According to Stoke's law, the viscous drag force, on an oil drop is proportional to:

1. \( \sqrt{V} \)
2. \( V^{2} \)
3. \( V^{-1} \)
4. \( V \)

Answer: \( V \)

Stoke's law describes the drag force on a sphere moving through a viscous fluid as directly proportional to its velocity.

Q10. was the first to discover that lightning is electric discharge.

1. Thomas Alva Edison
2. Nicolas Tesla
3. Benjamin Franklin
4. Isaac Newton

Answer: Benjamin Franklin

Benjamin Franklin conducted the famous kite experiment, proving that lightning is a form of electrical discharge.

Q11. Assertion Newton's law of gravitation resembles Coulomb's law of electrical forces. Reason Coulomb's law has the product of two charges in place of the product of the masses, and the electrostatic constant in place of the gravitational constant.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Answer: Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Both laws describe forces inversely proportional to the square of the distance, with analogous constants and variables. The Reason explains this similarity.

Q12. Which of the following will change the value of the equilibrium constant for the reaction? \( N_{2}(g)+O_{2}(g) \leftrightharpoons 2 N O(g) \)

1. Add more \( N_{2} \)
2. Increase of pressure
3. Use a smaller reaction vessel
4. Increase the temperature

Answer: Increase the temperature

The equilibrium constant is only affected by temperature changes because it is related to the reaction's enthalpy and Gibbs free energy.