Chapter 10 Wave Optics
Chapter 10 Wave Optics Question 1. Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) reflected, and (b) refracted light ? Refractive index of water is 1.33. (C.B.S.E. Sample Paper 1991)Answer: (a) For reflected light wavelength is unchanged i. e. X = 589 […]
Chapter 9 Ray Optics and Optical Instruments
Chapter 9 Ray Optics and Optical Instruments Question 1. A small candle 2.5 cm in size is placed 27 cm in front of a concave mirror of a radius of curvature of 36 cm. At what distance from the mirror should a screen be placed in order to receive a sharp image? Describe the nature […]
Chapter 8 Electromagnetic Waves
Chapter 8 Electromagnetic Waves Question 1. Figure shows a capacitor made of two circular plates each of radius 12 cm and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in figure). The charging current is constant and equal to 0.15 A. (a) Calculate the capacitance and the rate […]
Chapter 7 Alternating Current
Chapter 7 Alternating Current Question 1. A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply. (a) What is the rms value of current in the circuit? (b) What is the net power consumed over a full cycle? Answer: Question 2. (a) The peak voltage of an a.c. supply is 300 […]
Chapter 6 Electromagnetic Induction
Chapter 6 Electromagnetic Induction Question 1. Predict the direction of induced current in the situations described by the following Fig. 2(a) to (f). Answer: (a) By Lenz’s law, the face of the coil towards the south pole of the magnet opposes the south pole. So this face should behave as the south pole. Hence the […]
Chapter 5 Magnetism and Matter
Chapter 5 Magnetism and Matter Question 1. Answer the following questions regarding earth’s magnetism : (a) A vector needs three quantities for its specification. Name the three independent quantities conventionally used to specify the earth’s magnetic field. (b) The angle of dip at a location in southern India is about 18°. Would you expect a […]
Chapter 4 Moving Charges and Magnetism
Chapter 4 Moving Charges and Magnetism Question 1. A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the center of the coil? Answer: Question 2. A long straight wire carries a current of 35 […]
Chapter 3 Current Electricity
Chapter 3 Current Electricity Question 1. The storage battery of a car has an e.m.f. of 12 V. If the internal resistance of the battery is 0.4Ω, what is the maximum current that can be drawn from the battery ? Answer: Question 2. A battery of e.m.f. 10 V and internal resistance 3Ω is connected […]
Chapter 2 Electrostatic Potential and Capacitance
Chapter 2 Electrostatic Potential and Capacitance Question 1. Two charges 5 x 10-8 C and -3 x 10-8 C are located 16 cm apart. At what point(s) on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero. Ans. Let the potential be zero at 0, […]
Chapter 1 Electric Charges and Fields
Chapter 1 Electric Charges and Fields Question 1. What is the force between two small charged spheres having charges of 2 x 10-7 C and 3 x 10-7 C placed 30 cm apart in the air? Answer: Question 2. The electrostatic force on a small sphere of charge 0.4 μC due to another small sphere […]