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PCM Exam Solutions with Verified Answers and Detailed Rationale
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PCM Exam Solutions with Verified Answers and Detailed Rationale
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1. When measuring the voltage across a resistor in a circuit, whichdevice should be connected in parallel?
A. Ammeter
B. Voltmeter
C. Galvanometer
D. Thermistor
Answer: B) Voltmeter
Rationale: A voltmeter is designed to measure the potential difference
across components and should be connected in parallel to the resistor.
2. In a practical experiment involving the diffraction of light, what can
be determined by observing the interference pattern?
A. The refractive index of the medium
B. The wavelength of light
C. The speed of light
D. The angle of incidence
Answer: B) The wavelength of light
Rationale: The diffraction pattern produced by light can be used to
calculate its wavelength based on the spacing of the interference
fringes.
,3. What is the effect of increasing the temperature of a conducting wire
in a practical experiment on its resistance?
A. The resistance increases
B. The resistance decreases
C. The resistance stays the same
D. The resistance fluctuates
Answer: A) The resistance increases
Rationale: For most conductors, increasing the temperature causes the
atoms to vibrate more, increasing resistance.
4. During the experiment to verify the laws of refraction, what
property of the material is typically calculated?
A. Density
B. Refractive index
C. Surface area
D. Temperature
Answer: B) Refractive index
Rationale: The refractive index of the material is calculated by
measuring the angles of incidence and refraction and applying Snell’s
Law.
5. In the experiment to determine the specific heat capacity of a solid,
what is the main measurement required?
, A. Change in mass
B. Change in temperature
C. Energy supplied to the system
D. Change in pressure
Answer: B) Change in temperature
Rationale: The specific heat capacity is calculated by measuring the
temperature change of the substance when a known amount of energy
is supplied.
6. What should be the orientation of the light ray in an experiment to
study total internal reflection?
A. It should be incident at an angle greater than the critical angle.
B. It should be incident at an angle less than the critical angle.
C. It should be normal to the surface.
D. It should be parallel to the surface.
Answer: A) It should be incident at an angle greater than the critical
angle.
Rationale: Total internal reflection occurs when the angle of incidence
is greater than the critical angle, causing the light to reflect completely
within the medium.
7. In a circuit experiment with a resistor and a battery, which of the
following will increase the current in the circuit?
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