Physics class tests for PUC, ISc, XII in the CBSE, ICSE (CISCE), State boards.

Subject: Physics                                          

Test: Class test — III

Class: PUC — II (also good for ISC — II)

date: 5th August 2013.

Time: 55 minutes 

Total marks: 35

Section A

Objective — 7 questions each carry 1 mark, all questions to be answered.

Question 1

Targets in X-ray tube are made of high atomic number metals. Examples are

A. Tungsten and Platinum              B. Nickel and Chromium

C. Uranium and Plutonium            D. Sodium and Mercury

Question 2

Electric and magnetic fields do not deflect which of the following

A. X-rays                    B. Y-rays

C. Electrons              D. Cosmic Rays

Question 3

Why K_a and K_b lines are produced — chose only one appropriate answer.

A. Electronic transitions                                                           B. Atomic collisions

C. Radioactive decay                                                                  D. Nuclear transmutation

Question 4

Exactly why there is quantization of physical variables such as momentum, angular momentum, energy, orbital distance and speed?

A. Wave-particle duality                                         B. Interference of waves

C. Particle acceleration to speed of light            D. Resistance experienced by particles in conductors

Question 5

Cathode rays are streams of

A. Electrons                                         B. X-rays

C. Nucleons                                          D. High atomic number elements

Question 6

Kirchhoff’s loop rule is based on?

A. Conservation of charge                 B. Conservation of energy

C. Conservation of baryon number D. Conservation of lepton number

Question 7

Kirchhoff’s junction rule is based on?

A. Conservation of charge                 B. Conservation of energy

C. Conservation of baryon and lepton number D. Conservation of azimuthal quantum number

Section B

Subjective — 14 questions carry 2 marks each, all to be answered.

Question 8

If threshold frequency is 5\times 10^4 Hz whats the work function of the metal in eV or joule?

Question 9

3 capacitors C = 5\hspace{2pt} \mu F each are in series, whats their equivalent resistance?

Question 10

3 capacitors C = 5\hspace{2pt} \mu F each are in parallel combination, whats their equivalent resistance?

Question 11

If a potential difference of 5\hspace{2pt}V is applied at two ends of a 60\hspace{2pt}cm long metal wire with current density j = 10^{-7}\hspace{2pt}\frac{A}{m^2} whats conductivity of the wire?

Question 12

In a Wheatstone bridge if P = 5\hspace{2pt} \Omega  and Q = 10 \hspace{2pt}\Omega  are the resistors in one arm, and R = 15 \hspace{2pt}\Omega what would the unknown resistor S in the 2^{nd}  arm be?

Question 13

If work function of a metal is 50 \hspace{2pt}eV  what would the maximum kinetic energy of any e^{-}  be, given a light of energy of 100 \hspace{2pt}eV falls on the metal? Whats the stopping potential?

Question 14

Name 4 sources of electric power that can be harnessed for household applications.

Question 15

If 3 cells of emf \mathcal{E}_1, \mathcal{E}_2, \mathcal{E}_3  are connected in series with their + and – terminals connected in sequential order and each has a back-emf \mathcal{E}_1 ', \mathcal{E}_2 ', \mathcal{E}_3 '  whats the equivalent emf of the series?

Question 16

If a cell \mathcal{E}_1 = 5 \hspace{2pt} V  and \mathcal{E}_2 = 5 \hspace{2pt} V  are connected in parallel with zero internal resistance for both whats their equivalent emf?

Question 17

For principal quantum number n=5 whats the speed of an electron in a hydrogen atom?

Question 18

What would be the wavelength of a radiation of energy 50\hspace{2pt}MeV ?

Question 19

For a free electron of speed 0.1\hspace{2pt}c with c=3\times 10^8\hspace{2pt}\frac{m}{s}  what is the de-Broglie wavelength?

Question 20

If a conductor of length 50\hspace{2pt}cm and area of cross section 1\hspace{2pt}mm^2  carries a current of 2\hspace{2pt}A, when a battery of emf with ideal terminal voltage 50\hspace{2pt}V  is connected across, what is the resistivity of the wire?

Question 21

In Thomson’s e/m experiment the e^{-} is going in a circle of circumference 1\hspace{2pt}m then whats the speed of the e^{-} if the magnetic field intensity B is 10 \hspace{2pt}T where T ≡ Tesla, is SI unit of magnetic field intensity.

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