MCQ Collection
ECAT MCQs
Practice ECAT questions with answers and explanations.
Choose an option to check your answer.
Correct Answer: A. Rate of flow of electric charge
Explanation:
Current is I=Q/t.
Its SI unit is the ampere.
Choose an option to check your answer.
Correct Answer: B. 0.333
Explanation:
Snell's law gives 1×sin30° = 1.5 sinr.
Sinr=0.5/1.5≈0.333.
Choose an option to check your answer.
Correct Answer: B. Energy transferred per unit charge
Explanation:
Potential difference is V=W/Q.
One volt equals one joule per coulomb.
Choose an option to check your answer.
Correct Answer: C. 41.8°
Explanation:
The critical angle satisfies sin c = 1/1.5.
C≈sin^-1(0.667)=41.8°.
Choose an option to check your answer.
Correct Answer: C. Opposition to electric current
Explanation:
Resistance relates voltage and current through Ohm's law.
Its SI unit is the ohm.
Choose an option to check your answer.
Correct Answer: D. 4 D
Explanation:
Power is reciprocal focal length in metres.
P=1/0.25 = 4 dioptres.
Choose an option to check your answer.
Correct Answer: D. Current is proportional to voltage for a conductor at constant physical conditions
Explanation:
An ohmic conductor has V=IR under constant temperature and conditions.
Its V-I graph is linear through the origin.
Choose an option to check your answer.
Correct Answer: A. An image formed where light rays actually converge
Explanation:
A real image can be projected onto a screen.
It is usually inverted in simple lens and mirror systems.
Choose an option to check your answer.
Correct Answer: B. 0.628 s
Explanation:
Period is T=2π/ω.
T=2π/10≈0.628 s.
Choose an option to check your answer.
Correct Answer: B. An image formed where rays appear to originate
Explanation:
Virtual images arise from backward extensions of diverging rays.
They cannot be captured directly on a screen.
Choose an option to check your answer.
Correct Answer: C. 20 m/s
Explanation:
Speed is distance divided by time.
8/0.4 = 20 m/s.
Choose an option to check your answer.
Correct Answer: C. Virtual, upright, and same size
Explanation:
A plane mirror forms an image behind the mirror at equal distance.
Its lateral orientation is reversed.
