Select the correct statement:

• A) Blue light has a higher frequency than x rays
• B) Radio waves have higher frequency than gamma rays
• C) Ultraviolet light has a longer wavelength than infrared
• D) Gamma rays have higher frequency than infrared waves

In US the electricity standards are:

• A) 120 Volts and 60 Hertz
• B) 120 Volts and 50 Hertz
• C) 100 Volts and 50 Hertz
• D) 230 Volts and 50 Hertz

Which of the following have the greatest wavelength?

• A) Ultraviolet
• B) Radio waves
• C) Gamma rays
• D) Infrared

Which of the following is usually taken to make the core of a transformer?

• A) Hard iron
• B) Copper
• C) Aluminum
• D) Soft iron

In a vacuum, the conduction current is __________:

• A) Infinity
• B) Undetermined
• C) Zero
• D) Unity

We desire to make an LC circuit that oscillates at 100 Hz using an inductance of 2.5H. We also need a capacitance of:

• A) 1 F
• B) 100μF
• C) 1μF
• D) 1mF

Potentiometer can be used as

• A) Galvanometer
• B) Potential divider
• C) Ammeter
• D) Ohm meter

Inductive reactance XL of an inductor is:

• A) 2πfL
• B) πfL
• C) 4πfL
• D) 2πL

The graphical representation of Ohm’s law is:

• A) Hyperbola
• B) Straight line
• C) Parabola
• D) Ellipse

A transformer is employed to:

• A) Obtain a suitable D.C. voltage.
• B) Convert A.C. into D.C.
• C) Obtain a suitable A.C. voltage.
• D) Convert D.C. into A.C.

In the context of capacitors, how is energy related to the electric field strength?

• A) Energy is directly proportional to the electric field strength
• B) Energy is unrelated to the electric field strength
• C) Energy is inversely proportional to the electric field strength
• D) Energy is proportional to the square of the electric field strength

If potential difference across two plates of a capacitor is doubled, then energy stored in it will be:

• A) Four times
• B) Two times
• C) Eight times
• D) Remains same

The primary of a 3:1 step-up transformer is connected to a source and the secondary is connected to a resistor R. The power dissipated by R in this situation is P. If R is connected directly to the source it will dissipate a power of:

• A) P
• B) P/3
• C) P/9
• D) 3P

What does Faraday's law of electromagnetic induction state regarding induced EMF?

• A) The induced EMF is directly proportional to the magnetic field strength.
• B) The induced EMF is independent of the magnetic flux.
• C) The induced EMF is directly proportional to the rate of change of magnetic flux.
• D) The induced EMF is directly proportional to the magnetic flux.

If velocity of a conductor moving through a magnetic field B is made zero then motional emf is:

• A) -v/LB
• B) -vBL
• C) Zero
• D) -BL/v

Power of an electric generator of voltage (V) and driving current (I) through an appliance is:

• A) I/Q
• B) VR
• C) IR
• D) V2/R

According to Coulomb's law, as the distance between two charges increases:

• A) The force becomes zero
• B) The force decreases
• C) The force remains constant
• D) The force increases

Electromagnetic waves were experimentally discovered by:

• A) Einstein
• B) Hertz
• C) Maxwells
• D) Ampere

The lenz’s law refers to:

• A) Potential difference
• B) Induced potential
• C) Motional emf
• D) Induced current

A charge Q is moving with a velocity (v) parallel to a magnetic field (B) . Force on the charge due to magnetic field is:

• A) Constant
• B) Maximum
• C) Minimum
• D) Zero