The unit of specific heat capacity is MCQ with Answer and Explanation

The unit of specific heat capacity is
A. J/kg
B. J/kg°C
C. J/°C
D. J
Answer: Option B
Solution (By JKExamLibrary)
Q = m c ΔT => c = Q/(m ΔT), unit J/(kg °C).

This question belongs to: Science Physics

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Question #1 Report Error
Refractive index n = c/v. For glass n=1.5, light speed is:
A. 1.5×10⁸ m/s
B. 2×10⁸ m/s
C. 3×10⁸ m/s
D. 4.5×10⁸ m/s

Correct Answer: Option B


Explanation:
v = c/n = 3×10⁸/1.5 = 2×10⁸ m/s. Direct refractive index formula application. Memory tip: 'Higher n ⇒ slower light; v = c/n'. Basic optics calculation frequently tested in competitive exams to verify formula recall and unit handling.

This question belongs to: Science Physics
Question #2 Report Error
The energy stored in an inductor of inductance L carrying current I is
A. L²I
B. LI²
C. ½LI²
D. ½LI

Correct Answer: Option C


Explanation:
Magnetic energy stored = ½ L I², analogous to capacitor energy ½ C V². L is inductance in henry (H). Energy stored in magnetic field.

This question belongs to: Science Physics
Question #3 Report Error
A bullet of mass 10 g moving at 300 m/s penetrates 10 cm into a wooden block. Average resistive force is
A. 1500 N
B. 4500 N
C. 3000 N
D. 9000 N

Correct Answer: Option B


Explanation:
KE lost = ½ m v² = ½×0.01×90000 = 450 J. Work = F×s => 450 = F×0.1 => F = 4500 N.

This question belongs to: Science Physics