Which of the following statements about cathode rays is incorrect? MCQ with Answer and Explanation

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Which of the following statements about cathode rays is incorrect?

A. They are made up of electrons.

B. They travel in straight lines.

C. Their nature depends on the gas used in the discharge tube.

D. They are deflected by magnetic and electric fields.

Answer: Option C

Solution (By JKSSB Mock Tests)

Cathode rays consist of electrons, which are fundamental particles. Therefore, their nature (charge to mass ratio) is independent of the gas used in the cathode ray tube or the material of the cathode. All other statements are correct properties of cathode rays, demonstrating their fundamental particle nature.

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Question #1

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If the half-life of a radioactive substance is 10 days, what fraction of the original substance will remain after 30 days?

A. 1/8

B. 1/2

C. 1/4

D. 1/16

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Correct Answer: Option A

Explanation:
The number of half-lives elapsed is 30 days / 10 days = 3. The fraction remaining is (1/2)ⁿ, where n is the number of half-lives. So, (1/2)³ = 1/8. After 10 days: 1/2; after 20 days: 1/4; after 30 days: 1/8 of the original amount remains.

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Question #2

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Which of the following is a pure substance?

A. Brass

B. Oxygen gas

C. Sea water

D. Milk

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Correct Answer: Option B

Explanation:
Oxygen (O₂) is an element, a pure substance. Milk is a colloid; brass is an alloy (mixture); sea water is a solution (mixture). Pure substances have fixed composition.

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Question #3

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Which of the following is a characteristic property of ionic compounds?

A. They are soluble in water and conduct electricity in molten or aqueous state.

B. They have low melting and boiling points.

C. They are soluble in non-polar solvents like benzene.

D. They are good conductors of electricity in the solid state.

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Correct Answer: Option A

Explanation:
Ionic compounds are soluble in polar solvents like water. In the solid state, ions are fixed in a lattice and cannot move, so they don't conduct. However, in molten or aqueous states, the ions become free to move, allowing them to conduct electricity. They generally have high melting points.

This question belongs to: Science chemistry

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