Explanation

Telescope: It is a device used to see distant objects.

The word telescope was coined in 1611 by the Greek mathematician Giovanni Demisiani 

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ND22-1-2023

Explanation

A stone thrown from a height follows a projectile motion, which traces a parabolic path under gravity.

This occurs due to the combination of constant horizontal velocity and accelerated vertical motion.

Explanation

Ball falls 20m, so time taken is found using:

s = 1/2 gt²

20 = 1/2 × 10 × t²

t = 2s

Vertical velocity when it hits the ground:

v_y = gt = 10 × 2 = 20 m/s

Since it hits at 45°, v_x = v_y = 20 m/s

Explanation

Electric flux (Φ) is maximum when E and A are parallel, i.e., angle = 0°.

Formula: Φ = E·A·cosθ → cos(0°) = 1 gives maximum flux.

Explanation

The gravitational constant (G) is given by F = G * (m1 * m2) / r².

Unit of G = N * m² / (kg * kg) = Nm²kg⁻².

Explanation

Curie (Ci) is a unit that measures the rate of radioactive decay.

1 Curie = 3.7 × 10¹⁰ disintegrations per second.

Explanation

Power = Work / Time = (Force × Distance) / Time

= (Mass × Acceleration × Distance) / Time

= [M] × [LT-2] × [L] / [T] = [ML2T-3].

Explanation

The AND gate represents a series gate.

It only outputs a high signal when all its inputs are high.

Similar to a series connection where current flows only if all conditions are met.

Explanation

The Lyman series of the hydrogen spectrum lies in the ultraviolet region.

Explanation

Among the given options, the closest one is 45000 Å.