Subject

Physics

Class

CBSE Class 12

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

1.

The susceptibility of a magnetic material is –2.6 × 10–5. Identify the type of magnetic material and state its two properties.     


The susceptibility of a magnetic material is –2.6 × 10–5. Identify the type of magnetic material and state its two properties.     

2342 Views

2.

A cell of emf E and internal resistance r is connected to two external resistances R1 and R2 and a perfect ammeter. The current in the circuit is measured in four different situations:

(i) without any external resistance in the circuit.

(ii) with resistance R1 only

(iii) with R1 and R2 in series combination

(iv) with R1 and R2 in parallel combination.

The currents measured in the four cases are 0.42 A, 1.05 A, 1.4 A and 4.2 A, but not necessarily in that order. Identify the currents corresponding to the four cases mentioned above.      

A cell of emf E and internal resistance r is connected to two external resistances R1 and R2 and a perfect ammeter. The current in the circuit is measured in four different situations:

(i) without any external resistance in the circuit.

(ii) with resistance R1 only

(iii) with R1 and R2 in series combination

(iv) with R1 and R2 in parallel combination.

The currents measured in the four cases are 0.42 A, 1.05 A, 1.4 A and 4.2 A, but not necessarily in that order. Identify the currents corresponding to the four cases mentioned above.      
1793 Views

3.

When electrons drift in a metal from lower to higher potential, does it mean that all the free electrons of the metal are moving in the same direction?


When electrons drift in a metal from lower to higher potential, does it mean that all the free electrons of the metal are moving in the same direction?

5451 Views

4.

Name the physical quantity which remains same for microwaves of wavelength 1 mm and UV radiations of 1600 Å in vacuum. 


Name the physical quantity which remains same for microwaves of wavelength 1 mm and UV radiations of 1600 Å in vacuum. 

1286 Views

5.

Two identical circular wires P and Q each of radius R and carrying current ‘I’ are kept in perpendicular planes such that they have a common center as shown in the figure. Find the magnitude and direction of the net magnetic field at the common center of the two coils. 


Two identical circular wires P and Q each of radius R and carrying current ‘I’ are kept in perpendicular planes such that they have a common center as shown in the figure. Find the magnitude and direction of the net magnetic field at the common center of the two coils. 

3743 Views

6.

When an ideal capacitor is charged by a dc battery, no current flows. However, when an ac source is used, the current flows continuously. How does one explain this, based on the concept of displacement current? 


When an ideal capacitor is charged by a dc battery, no current flows. However, when an ac source is used, the current flows continuously. How does one explain this, based on the concept of displacement current? 

2597 Views

7.

Show on a graph, the variation of resistivity with temperature for a typical semiconductor. 


Show on a graph, the variation of resistivity with temperature for a typical semiconductor. 

927 Views

8.

Why should electrostatic field be zero inside a conductor? 


Why should electrostatic field be zero inside a conductor? 

950 Views

9.

The horizontal component of the earth’s magnetic field at a place is B and angle of dip is 60°.

What is the value of vertical component of earth’s magnetic field at equator?     

The horizontal component of the earth’s magnetic field at a place is B and angle of dip is 60°.

What is the value of vertical component of earth’s magnetic field at equator?     
2452 Views

10.

Predict the directions of induced currents in metal rings 1 and 2 lying in the same plane where current I in the wire is increasing steadily. 




Predict the directions of induced currents in metal rings 1 and 2 lying in the same plane where current I in the wire is increasing steadily. 



4289 Views