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CBSE Physics Class 12 Sample Paper Quiz

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Questions and Answers

What is the final image in an astronomical telescope?

Real and inverted

Why can't alternating current be measured by a DC ammeter?

AC changes direction

What happens to the width of the forbidden gap with an increase in temperature?

Decreases

What is the kinetic energy of an electron accelerated in a potential difference of 100V?

1.6 # 10-17 J Signup and view all the answers

What is the formula to calculate the total electric charge Q that passes any point in a circuit during time Tt?

Q = Tφ Tt Signup and view all the answers

How do you calculate the equivalent capacitance of an infinite number of capacitors in parallel combination?

4 µF Signup and view all the answers

In an electric circuit, what is the formula for power consumption?

V 2 R Signup and view all the answers

Explain the concept of work done in moving a test charge between two points in an electric field.

Work done is equal to the difference in potential energy between the two points, and can be calculated using the formula W = q(V2 - V1). Signup and view all the answers

According to Faraday's laws of electromagnetic induction, what is the relationship between the induced electromotive force (emf) and the rate of change of magnetic flux?

emf = -N dΦ/dt Signup and view all the answers

Describe the factors affecting the magnetic field produced by a solenoid.

The factors affecting the magnetic field produced by a solenoid include the number of turns per unit length (n) and the current flowing through it (I). Signup and view all the answers

Differentiate between ferromagnetic and paramagnetic substances based on their magnetic properties.

Ferromagnetic substances have permanent magnetic moments even in the absence of an external magnetic field, while paramagnetic substances are weakly attracted to magnetic fields. Signup and view all the answers

Explain the concept of phase difference in alternating current (A.C.) circuits.

Phase difference in A.C. circuits refers to the relative shift in timing between two alternating quantities such as voltage and current. Signup and view all the answers