# CBSE Class 12 Physics Previous Year Board Papers Download With Solutions

CBSE 12th Physics Previous year Question Papers are the best source to study and prepare for the exam. CBSE board 12th class papers for Physics will contain all the questions from NCERT syllabus. Physics includes the questions from all kinds of sections. So, prepare well for the exam. Below are the some questions which are being asked in the CBSE exam in earlier years. A full set of CBSE Physics 12th Previous papers is given below, following which the preparations can be done in more better way for the exam.

Ques1: Magnetic field lines can be entirely confined within the core of toroid, but not within a straight solenoid. Why?

Ques2: A cell of emf ‘E’ and internal resistance ‘r’ is connected across a variable resistor ‘R’. Plot a graph showing the variation of terminal potential ‘V’ with resistance R. Predict from graph the condition under which ‘V’ becomes equal to ‘E’.

Ques3: Why are high frequency carrier waves used for transmission?

OR

What is meant by term modulation? Draw a block diagram of simple modulator for obtaining an AM signal.

Ques4: a) Define self- inductance. Write its S.I. unit?

b) Derive an expression for self- inductance of a long solenoid of length l, cross sectional area A and N number of turns

Ques5: Derive the expression for force per unit length between 2 long straight parallel current carrying conductors. Hence define one ampere.

OR

Explain the principle and working of cyclotron with help of schematic diagram. Write expression for cyclotron frequency.

Ques6: a) Why does the electric field inside a dielectric decrease wen it is placed in an external electric field

b) A parallel plate capacitor with air between the plates has a capacitance of 8 PF. What will be capacitance if distance between plates he reduced by half and space between them is filled with a substance of dielectric constant K=6?