Convex lens forms virtual image when object is: MCQ with Answer and Explanation

Convex lens forms virtual image when object is:
A. At 2F
B. Between F and 2F
C. Beyond 2F
D. Within focal length
Answer: Option D
Solution (By JKSSB Mock Tests)
Convex lens: object within focal length (u < f) produces virtual, erect, magnified image (magnifying glass). Beyond F: real images. Memory tip: 'Convex lens: u < f ⇒ virtual image; u > f ⇒ real image'. Ray optics concept frequently tested in competitive exams to verify lens image formation rules.

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Practice More Physics Questions

Question #1
The frequency of ultrasonic wave is
A. 20 Hz - 20 kHz
B. > 20 MHz
C. < 20 Hz
D. > 20 kHz

Correct Answer: Option D


Explanation:
Above 20 kHz.

This question belongs to: Science Physics
Question #2
What is the excess pressure strictly inside a soap bubble of radius R and surface tension T?
A. T / R
B. T / 2R
C. 2T / R
D. 4T / R

Correct Answer: Option D


Explanation:
A liquid drop has only one free surface, so its excess pressure is P = 2T/R. However, a soap bubble in the air has two completely free surfaces (an inner one and an outer one). Because both surfaces exert surface tension forces inward, the total excess pressure inside a soap bubble is exactly double: P = 4T/R.

This question belongs to: Science Physics
Question #3
Which of the following is an SI derived unit named after a scientist?
A. Kilogram
B. Metre
C. Second
D. Pascal

Correct Answer: Option D


Explanation:
Pascal (Pa) named after Blaise Pascal, derived unit for pressure (N/m²). Metre, kilogram, second are base units. Joule, watt, newton, hertz, coulomb also named scientists.

This question belongs to: Science Physics