A ball is thrown vertically upward with an initial velocity of 20 m/s. What is the maximum height reached? (Take g = 10 m/s²)

The correct answer is B: 20 m. Using v² = u² - 2gh, where final velocity v = 0, u = 20 m/s, g = 10 m/s². Therefore, 0 = 400 - 20h, giving h = 20 m.

A wire of length L and cross-sectional area A has resistance R. If the wire is cut into two equal halves and connected in parallel, what is the new resistance?

The correct answer is A: R/4. Each half has resistance R/2. When connected in parallel: 1/R_new = 1/(R/2) + 1/(R/2) = 4/R, so R_new = R/4.

Which of the following correctly describes the photoelectric effect?

The correct answer is A: Emission of electrons from a metal when exposed to light of sufficient frequency. The photoelectric effect occurs when light of frequency greater than or equal to the threshold frequency strikes a metal surface, causing electron emission. It demonstrates the particle nature of light.

Hardest natural substance?

The correct answer is C: Diamond. Diamond = 10 on Mohs scale.

A convex lens of focal length 20 cm is used as a magnifying glass. If an object is placed 5 cm from the lens, what is the nature of the image?

The correct answer is B: Virtual, erect, magnified. When object is between lens and focus (u < f), a convex lens produces virtual, erect, magnified image

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Difficulty: All Easy Medium Hard 1–2 of 2

Topics in General Science

All Physics 106 Chemistry 9 Biology 2 Botany 78 Human Body 4 Disease & Health 2 Space & Astronomy 5 Environment 1

Q.1 Easy Disease & Health

Vitamin C deficiency causes?

A Rickets

B Scurvy

C Night blindness

D Beriberi

Correct Answer: B. Scurvy

EXPLANATION

Scurvy from Vitamin C deficiency.

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Q.2 Easy Disease & Health

Vitamin produced by sunlight?

A Vitamin A

B Vitamin B12

C Vitamin C

D Vitamin D

Correct Answer: D. Vitamin D

EXPLANATION

Sunlight → Vitamin D synthesis.

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