A copper wire is stretched elastically. Which property is NOT affected?

The correct answer is A: Young's modulus. Young's modulus is a material property independent of the wire's dimensions or elastic deformation state. It depends only on the material composition and atomic structure, not on physical changes.

Which of the following statements about gravitational force is correct?

The correct answer is C: Gravitational force is always attractive. Gravitational force is always attractive, acts between any two masses, is independent of the medium, and is governed by Newton's law of universal gravitation.

Which of the following is a non-ohmic conductor?

The correct answer is B: Tungsten filament in a light bulb. A tungsten filament's resistance changes significantly with temperature during operation, making it non-ohmic. Metals at constant temperature follow Ohm's law.

Planet closest to Sun?

The correct answer is B: Mercury. Mercury is closest to Sun.

The phenomenon of senescence in plants is primarily controlled by which hormone?

The correct answer is D: Ethylene. Ethylene is the major hormone controlling senescence (aging) in plants, promoting leaf yellowing, fruit ripening, and abscission.

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General Science

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96 Q 8 Topics Take Mock Test

Difficulty: All Easy Medium Hard 1–10 of 96

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Q.1 Medium Physics

A body moves in a circle of radius 5 m with constant speed 10 m/s. What is the centripetal acceleration?

A 2 m/s²

B 20 m/s²

C 50 m/s²

D 100 m/s²

Correct Answer: B. 20 m/s²

EXPLANATION

Centripetal acceleration a = v²/r = (10)²/5 = 100/5 = 20 m/s².

Test

Q.2 Medium Physics

Two capacitors of 2 μF and 3 μF are connected in series. What is the equivalent capacitance?

A 5 μF

B 1.2 μF

C 6 μF

D 0.5 μF

Correct Answer: B. 1.2 μF

EXPLANATION

For capacitors in series: 1/C = 1/C₁ + 1/C₂ = 1/2 + 1/3 = 5/6. Therefore C = 6/5 = 1.2 μF.

Test

Q.3 Medium Physics

A ball is thrown vertically upward with initial velocity 20 m/s. What maximum height does it reach? (g = 10 m/s²)

A 10 m

B 20 m

C 30 m

D 40 m

Correct Answer: B. 20 m

EXPLANATION

At maximum height, v = 0. Using v² = u² - 2gh: 0 = 20² - 2(10)h. 20h = 400. h = 20 m.

Test

Q.4 Medium Physics

Which law of thermodynamics explains why heat cannot spontaneously flow from a colder body to a hotter body?

A First Law of Thermodynamics

B Second Law of Thermodynamics

C Third Law of Thermodynamics

D Zeroth Law of Thermodynamics

Correct Answer: B. Second Law of Thermodynamics

EXPLANATION

The Second Law of Thermodynamics states that entropy of an isolated system increases or remains constant. Heat spontaneously flows from hot to cold, not vice versa, establishing the direction of processes.

Test

Q.5 Medium Physics

A moving object has kinetic energy K. If its velocity is doubled, what will be its new kinetic energy?

A 2K

B 4K

C K/2

D K/4

Correct Answer: B. 4K

EXPLANATION

Kinetic energy KE = (1/2)mv². When velocity is doubled: KE' = (1/2)m(2v)² = (1/2)m(4v²) = 4 × (1/2)mv² = 4K.

Test

Q.6 Medium Physics

Which of the following correctly describes the photoelectric effect?

A Emission of electrons from a metal when exposed to light of sufficient frequency

B Emission of electrons from a metal when exposed to light of any frequency

C Absorption of light energy by electrons in a metal

D The bending of light around obstacles

Correct Answer: A. Emission of electrons from a metal when exposed to light of sufficient frequency

EXPLANATION

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.

Test

Q.7 Medium Physics

When a spring is compressed by 0.1 m, the elastic potential energy stored is 5 J. What is the spring constant?

A 500 N/m

B 1000 N/m

C 50 N/m

D 5000 N/m

Correct Answer: B. 1000 N/m

EXPLANATION

Elastic potential energy E = (1/2)kx². 5 = (1/2)k(0.1)². 5 = 0.005k. k = 1000 N/m.

Test

Q.8 Medium Physics

A sound wave has a frequency of 440 Hz and travels at 330 m/s in air. What is its wavelength?

A 0.75 m

B 145200 m

C 0.5 m

D 770 m

Correct Answer: A. 0.75 m

EXPLANATION

Using v = fλ, where v = 330 m/s and f = 440 Hz. λ = v/f = 330/440 = 0.75 m.

Test

Q.9 Medium Physics

Two resistances of 10 Ω and 20 Ω are connected in parallel. What is the equivalent resistance?

A 30 Ω

B 6.67 Ω

C 15 Ω

D 200 Ω

Correct Answer: B. 6.67 Ω

EXPLANATION

For parallel resistances: 1/R = 1/R₁ + 1/R₂ = 1/10 + 1/20 = 3/20. Therefore R = 20/3 = 6.67 Ω.

Test

Q.10 Medium Physics

A concave mirror has a focal length of 10 cm. An object is placed 5 cm from the mirror. What type of image is formed?

A Real, inverted, magnified

B Virtual, erect, magnified

C Real, inverted, diminished

D Virtual, erect, diminished

Correct Answer: B. Virtual, erect, magnified

EXPLANATION

When object distance (5 cm) < focal length (10 cm), the object is between the mirror and focus. A concave mirror forms a virtual, erect, and magnified image in this case.

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