BPSC CCE Prelims
Physics Previous Year Questions (PYQs)
Showing solved Previous Year Questions for Chapter: Physics
Topic Breakdown: Scroll →
What is the unit of measure of magnetic field?
Detailed Explanation:
The SI unit of magnetic field (magnetic flux density) is Tesla (T), named after physicist Nikola Tesla.
Cobalt is a ferromagnetic metal, Ampere measures electric current, and Ohm measures electrical resistance—none measure magnetic field strength.
One of the properties associated with X-rays is that they can be deflected by
Detailed Explanation:
X-rays are electromagnetic waves with no electric charge, so they travel unaffected by electric or magnetic fields.
Only charged particles (like electrons, protons, alpha particles) experience deflection in electric or magnetic fields; neutral electromagnetic radiation (X-rays, gamma rays, light) passes straight through.
Which of the following is responsible for production of shadow?
Detailed Explanation:
Shadows are formed because light travels in straight lines, a property called rectilinear propagation.
When an opaque object blocks light's path, it cannot bend around the obstacle, creating a dark region (shadow) behind it. Polarisation relates to wave orientation, diffraction to bending at edges, and interference to wave overlap patterns—none directly cause shadows.
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An electron of mass M kg and charge e coulomb travels from rest through a potential difference of V volts. The final energy in joules would be
Detailed Explanation:
When a charged particle accelerates through a potential difference V, the work done by the electric field equals W = charge × voltage = eV joules.
Since the electron starts from rest, all this work converts into kinetic energy, making the final energy = eV joules. The mass M determines the final velocity but does not appear in the energy equation.
Which of the following is the value of solar constant?
Detailed Explanation:
The solar constant is the amount of solar energy received per unit area at the top of Earth's atmosphere, perpendicular to the Sun's rays.
Its precise value is approximately 1.366 kW/m² (or 1366 W/m²), but for simplicity in calculations and standard examinations, it is commonly rounded to 1.4 kW/m² (1400 W/m²).
Which of the following is equivalent to tesla?
Detailed Explanation:
Tesla (T) is the SI unit of magnetic flux density. From the Lorentz force equation for a current-carrying conductor: F = I ℓ B, rearranging gives B = F / (I ℓ).
Therefore, 1 Tesla = 1 Newton / (Ampere × meter), which matches Option 4: Newton per ampere meter.
The meter that is used to measure the distance moved by the vehicle is known as:
Detailed Explanation:
Odometer is the instrument that measures the total distance traveled by a vehicle, displayed in kilometers or miles on the dashboard.
Ammeter measures electric current, Speedometer measures instantaneous speed, and Chronometer measures precise time.
Heat transfer that does not require a medium is called:
Detailed Explanation:
Radiation is the mode of heat transfer that does not require any material medium (solid, liquid, or gas).
It travels through electromagnetic waves (infrared rays) and can occur in vacuum, such as the Sun's heat reaching Earth through empty space.
Which of the following radiation is used to get relief from body aches?
Detailed Explanation:
Infra-red radiation produces heat when absorbed by body tissues, which increases blood circulation, relaxes muscles, and reduces pain and stiffness.
UV radiation can damage skin and does not provide therapeutic heat; visible radiation lacks the penetrating warmth needed for pain relief.
Which of the following is a non-contact force?
Detailed Explanation:
Non-contact forces act on objects without physical touch between them, examples include magnetic force, gravitational force, and electrostatic force.
Magnetic force operates through a magnetic field and can attract or repel objects from a distance without direct contact.
Frictional force and impact force both require physical contact between surfaces or objects, making them contact forces.
Which of the following is the resistance of the wire?
Detailed Explanation:
Ohm's Law defines the relationship between voltage (V), current (I), and resistance (R) as V = IR.
Rearranging this formula gives R = V/I, which is the standard definition of resistance in ohms (Ω).
Large number of thin strips of black paint are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will be
Detailed Explanation:
Black paint strips block portions of the convex lens, reducing the amount of light passing through each section of the lens.
Every point on the horse emits light that passes through multiple parts of the lens, so blocking some strips reduces overall brightness but does not create stripes in the image—the image remains a complete horse with lower intensity.
Shrillness of sound is determined by
Detailed Explanation:
Shrillness (or pitch) of sound is determined by the frequency of the sound wave.
Since frequency is inversely proportional to wavelength (f = v/λ, where v is constant in a given medium), wavelength determines pitch—shorter wavelength means higher frequency and shriller sound.
Amplitude determines loudness, not shrillness, while velocity depends on the medium and does not determine pitch.
Therefore, Option 3 (wavelength) is correct as it is directly related to frequency/pitch.
Which of the following photoelectric devices is most suitable for digital applications?
Detailed Explanation:
❌ The given answer is INCORRECT.
A photodiode is most suitable for digital applications because it operates in reverse bias mode and produces fast switching responses (ON/OFF states) essential for digital circuits, making it ideal for optical communication, sensors, and logic circuits.
A photovoltaic cell (solar cell) generates continuous electrical power from light and is designed for power generation applications, not digital switching or signal processing.
Photoemitters emit electrons when exposed to light but are used in specialized devices like photomultiplier tubes, not standard digital applications.
Correct Answer: Option 1 (Photodiode)
Ball bearings are used to convert static friction into
Detailed Explanation:
Ball bearings contain small spherical balls that convert static friction (friction between surfaces at rest) into rolling friction.
Rolling friction is significantly lower than sliding friction, allowing wheels, gears, and machinery to move smoothly and efficiently with reduced energy loss.