Q1. What is the effect called when sound waves spread out after passing through a narrow opening? (2019)
Solution:
The spreading out of sound waves after passing through a narrow opening is known as diffraction.
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Q2. What is the direction of the magnetic field around a current-carrying conductor? (2019)
Solution:
The direction of the magnetic field around a current-carrying conductor is given by the right-hand rule, which indicates a counterclockwise direction when viewed from the positive current side.
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Q3. If a car does 3000 J of work in moving a distance of 150 m, what is the average force exerted by the car? (2023)
Solution:
Average Force = Work / Distance = 3000 J / 150 m = 20 N
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Q4. What is the power consumed by a device that operates at 120V and draws a current of 3A? (2021)
Solution:
Power (P) = Voltage (V) × Current (I) = 120V × 3A = 360W.
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Q5. In a magnetic field, the direction of the magnetic force on a charged particle is given by which rule?
Solution:
The direction of the magnetic force on a charged particle moving in a magnetic field is determined by the right-hand rule.
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Q6. A force of 15 N is applied at an angle of 60° to the horizontal while moving an object 4 m. What is the work done by the force?
Solution:
Work done (W) = F × d × cos(θ) = 15 N × 4 m × cos(60°) = 15 N × 4 m × 0.5 = 30 J.
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Q7. What is the total current in a parallel circuit with three branches carrying 2 A, 3 A, and 5 A respectively?
Solution:
In a parallel circuit, the total current is the sum of the currents in each branch: I_total = 2 A + 3 A + 5 A = 10 A.
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Q8. What is the main characteristic of a black body in terms of radiation? (2019)
Solution:
A black body absorbs all radiation incident on it, making it an ideal emitter of thermal radiation.
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Q9. A person walks 3 km in 30 minutes. What is his speed in km/h? (2023)
Solution:
Speed = Distance / Time = 3 km / 0.5 h = 6 km/h.
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Q10. What is the magnification produced by a concave lens if the object is placed at a distance of 30 cm and the focal length of the lens is 15 cm? (2022)
Solution:
Using the lens formula and magnification formula, we find the magnification m = -v/u = -1.
