A 2 kg object accelerates at 5 m/s² when a net force is applied. What is the magnitude of the net force?

The correct answer is C: 10 N. Using F = ma, F = 2 × 5 = 10 N. This is a direct application of Newton's Second Law.

Which of the following pigments is primarily responsible for absorbing light in the red and far-red regions of the spectrum in photosynthesis?

The correct answer is B: Phytochrome. # Light Absorption Spectra in Photosynthesis **Phytochrome is a specialized photoreceptor protein that uniquely absorbs light in the red (660 nm) and far-red (730 nm) wavelength regions, making it distinct from other photosynthetic pigments.** ## Step 1: Understanding Photoreceptor Types Different p

A projectile is launched at an angle of 45° with initial velocity 20 m/s. What is the maximum height reached? (g = 10 m/s²)

The correct answer is B: 10 m. Vertical component of velocity: u_y = 20 sin(45°) = 20/√2 = 10√2 m/s. Maximum height h = u_y²/(2g) = (10√2)²/(2×10) = 200/20 = 10 m.

A Carnot engine operates between temperatures 400 K and 300 K. What is its maximum efficiency?

The correct answer is A: 0.25 or 25%. Carnot efficiency: η = 1 - (T_cold/T_hot) = 1 - (300/400) = 1 - 0.75 = 0.25 = 25%. This is the theoretical maximum for any heat engine.

Which of the following statements about plasmolysis is TRUE?

The correct answer is D: Both A and B. Plasmolysis is the shrinkage of protoplasm away from the cell wall when placed in hypertonic solution. It's reversible if not prolonged.

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34 Questions 10 Topics Take Test

Showing 1–10 of 34 questions in Physics

Q.1 Easy Physics

Newton first law also called?

ALaw of acceleration

BLaw of gravitation

CLaw of inertia

DLaw of reaction

Correct Answer: C. Law of inertia

Explanation:

First law = Law of Inertia.

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Q.2 Easy Physics

Unit of electric current?

AVolt

BOhm

CAmpere

DWatt

Correct Answer: C. Ampere

Explanation:

Current measured in Amperes.

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Q.3 Easy Physics

Ohm Law: V = ?

AI/R

BIR

CI+R

DI-R

Correct Answer: B. IR

Explanation:

V = I × R (Ohm Law).

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Q.4 Easy Physics

Sound cannot travel through?

AWater

BSteel

CVacuum

DAir

Correct Answer: C. Vacuum

Explanation:

Sound needs medium, not vacuum.

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Q.5 Easy Physics

A body is thrown vertically upward with a velocity of 40 m/s. What is the maximum height reached? (Take g = 10 m/s²)

A80 m

B40 m

C160 m

D120 m

Correct Answer: A. 80 m

Explanation:

Using v² = u² - 2gh, where final velocity v = 0, u = 40 m/s, g = 10 m/s². We get h = 1600/20 = 80 m

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Q.6 Easy Physics

Which of the following is NOT a SI base unit?

AAmpere

BKelvin

CNewton

DMole

Correct Answer: C. Newton

Explanation:

Newton is a derived unit (kg⋅m⋅s⁻²). Ampere, Kelvin, and Mole are SI base units

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Q.7 Easy Physics

A car moving at 20 m/s suddenly applies brakes with deceleration of 5 m/s². How far does it travel before stopping?

A20 m

B40 m

C60 m

D80 m

Correct Answer: B. 40 m

Explanation:

Using v² = u² + 2as, where v = 0, u = 20 m/s, a = -5 m/s². We get s = 400/10 = 40 m

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Q.8 Easy Physics

What is the SI unit of pressure?

ABar

BPascal

CAtm

DTorr

Correct Answer: B. Pascal

Explanation:

Pascal (Pa) is the SI unit of pressure, equal to 1 N/m²

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Q.9 Easy Physics

Which phenomenon explains the formation of a rainbow?

ARefraction and dispersion

BReflection only

CDiffraction only

DInterference only

Correct Answer: A. Refraction and dispersion

Explanation:

Rainbows form due to refraction of sunlight entering water droplets and dispersion of different wavelengths

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Q.10 Easy Physics

What is the angle of incidence when light ray falls on a plane mirror and the angle of reflection is 35°?

A35°

B55°

C70°

D90°

Correct Answer: A. 35°

Explanation:

According to law of reflection, angle of incidence equals angle of reflection

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