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MODEL PAPER 6 Physics - MODEL PAPER 6

CBSE - STD 12 Science - Physics (CBSE - English Medium). 38 questions in this chapter.

Question types

MODEL PAPER 6 question types

38 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

38
Questions
6
Question groups
5
Question types
Sample Questions

MODEL PAPER 6 questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
The layered lens is made of two kinds of glass. A point source of light is placed on its principal axis. If the reflections from the boundaries between layers are ignored, the lens will form
  • A
    no image at all
  • B
    two images
  • C
    infinite images
  • D
    only one image
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Q 2M.C.Q (1 Marks)1 Mark
The diode used in the circuit shown in the figure has a constant voltage drop at 0.5 V at all currents and a maximum power rating of 100 milliwatts. What should be the value of the resistor R, connected in series with diode for obtaining maximum current?
Image
  • A
    $20 \Omega$
  • B
    $6.76 \Omega$
  • C
    $5 \Omega$
  • D
    $5.6 \Omega$
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Q 3M.C.Q (1 Marks)1 Mark
When a negatively charged conductor is connected to earth
  • A
    Electrons flow from the earth to the conducto
  • B
    Protons flow from the conductor to the earth
  • C
    No charge flow occurs
  • D
    Electrons flow from the conductor to the earth
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Q 4M.C.Q (1 Marks)1 Mark
Which of the following phenomenon cannot take place with longitudinal waves (e.g., sound waves)?
  • A
    polarisation
  • B
    diffraction
  • C
    reflection
  • D
    interference
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Q 6Assertion (A) & Reason (B) MCQ1 Mark
Assertion (A): Transformers are used only in alternating current sources, not in direct current.
Reasons (R): Only a.c. can be stepped up or down by means of transformers.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
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Q 7Assertion (A) & Reason (B) MCQ1 Mark
Assertion (A): Skiers use air glasses.
Reason (R): Light reflected by snow is partially polarised.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false
  • D
    A is false but R is true.
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Q 8Assertion (A) & Reason (B) MCQ1 Mark
Assertion: Two concentric charged inner and outer shell are given. The potential difference between the shells depends on charge of inner shell.
Reason: Potential due to charge of outer shell remains same at every point inside the sphere.
  • ✓
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • C
    Assertion is correct statement but reason is wrong statement.
  • D
    Assertion is wrong statement but reason is correct statement.

Answer: A.

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Q 9Assertion (A) & Reason (B) MCQ1 Mark
Assertion (A): The de Broglie wavelength of a molecule varies inversely as the square root of temperature.
Reason (R): The root mean square velocity of the molecule depends on the temperature.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
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Q 102 Marks Questions2 Marks
What will be the path of a charged particle moving in a region of crossed (or transverse) uniform electrostatic and magnetic fields with initial velocity zero?
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Q 112 Marks Questions2 Marks
A beam of protons with a velocity $4 \times 10^5\ m / s$ enters a uniform magnetic field of $0.3 T$ at an angle $60^{\circ}$ to the magnetic field. Find the radius of the helical path taken by the proton beam. Also find the pitch of the helix mp $=1.67 \times 10^{-27} k$
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Q 122 Marks Questions2 Marks
The ground state energy of hydrogen atom is $-13.6 eV$. If an electron makes a transition from an energy level$-1.51 eV$ to $- 3.4 eV,$ then calculate the wavelength of the spectral line emitted and name the series of hydrogen spectrum to which it belongs.
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Q 132 Marks Questions2 Marks
Two crystals $C _1$ and $C _2$, made of pure silicon, are doped with arsenic and aluminium respectively.
a. Identify the extrinsic semiconductors so formed.
b. Why is doping of intrinsic semiconductors necessary?
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Q 142 Marks Questions2 Marks
Two magnetic poles, one of which is $10$ times as strong as the other, exert on each other a force equal to $9.604\  mN$ , when placed $10 \ cm$ apart in air. Find the strength of the two poles.
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Q 153 Marks Question3 Marks
A small flat search coil of area $5 cm^2$ with $140$ closely wound turns is placed between the poles of a powerful magnet producing magnetic field $0.09 \ T$ and then quickly removed out of the field region. Calculate
$a.$ change of magnetic flux through the coil, and
$b.$ emf induced in the coil.
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Q 163 Marks Question3 Marks
i. Define mutual inductance.
ii. A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes from 0 to 20 A in 0.5 s, what is the change of flux linkage with the other coil?
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Q 173 Marks Question3 Marks
In single slit diffraction, explain why the maxima at $\theta=\left(n+\frac{1}{2}\right)\left(\frac{\lambda}{a}\right)$ becomes weaker and weaker as an increases. State two important differences between interference and diffraction pattern.
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Q 193 Marks Question3 Marks
Deuteron is a bound state of a neutron and a proton with a binding energy $B =2.2\ MeV$. A $ \gamma-$ray of energy $E$ is aimed at a deuteron nucleus to try to break it into a $($neutron $+$ proton$)$ such that the $n$ and $p$ move in the direction of the incident $\gamma-$ray. If $E = B$, show that this cannot happen. Hence calculate how much bigger than $B$ must $E$ be for such a process to happen.
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Q 205 Marks Questions5 Marks
With the help of a diagram, explain the principle of a device which changes a low voltage into a high voltage but does not violate the law of conservation of energy. Give any one reason why the device may not be $100\%$ efficient.
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Q 215 Marks Questions5 Marks
a. State the condition for resonance to occur in series LCR a.c. circuit and derive an expression for resonant frequency.
b. Draw a plot showing the variation of the peak current $\left( i _{ m }\right)$ with frequency of the a.c, source used. Define the quality factor Q of the circuit.
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Q 225 Marks Questions5 Marks
$a.$ Explain why, for any charge configuration, the equipotential surface through a point is normal to the electric field at that point.
Draw a sketch of equipotential surfaces due to a single charge $(-q)$, depicting the electric field lines due to the charge.
$b.$ Obtain an expression for the work done to dissociate the system of three charges placed at the vertices of an equilateral triangle of side a as shown alongside.
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Q 235 Marks Questions5 Marks
$i.$ Define the capacitance of a capacitor. Obtain the expression for the capacitance of a parallel plate capacitor in vacuum in terms of plate area A and separation $d$ between the plates.
$ii.$ A slab of material of dielectric constant $k$ has the same area as the plates of a parallel plate $\frac{3 d}{4}$ capacitor but has a thickness -. Find the ratio of the capacitance with dielectric inside it to its capacitance without the dielectric.
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Q 245 Marks Questions5 Marks
A small transparent slab containing material of $\mu=1.5$ is placed along $AS _2 \ ($Figure$)$. What will be the distance from $O$ of the principal maxima and of the first minima on either side of the principal maxima obtained in the absence of the glass slab?
$AC = CO = D , S _1 C = S _2 C = d < D$
Image
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Q 25Case study (4 Marks)4 Marks
A charge is a property associated with the matter due to which it experiences and produces an electric and magnetic field. Charges are scalar in nature and they add up like real numbers. Also, the total charge of an isolated system is always conserved. When the objects rub against each other charges acquired by them must be equal and opposite.
Image
(i) The cause of charging is:
(a) the actual transfer of atoms
(b) the actual transfer of protons
(c) the actual transfer of electrons
(d) the actual transfer of neutrons

(ii) Pick the correct statement.
i. The glass rod gives protons to silk when they are rubbed against each other.
ii. The glass rod gives electrons to silk when they are rubbed against each other.
iii. The glass rod gains protons from silk when they are rubbed against each other.
iv. The glass rod gains electrons when they are rubbed against each other.
(a) Option (i) (b) Option (iv) (c) Option (iii) (d) Option (ii)

(iii) If two electrons are each $1.5 \times 10^{-10} m$ from a proton, as shown in Figure, magnitude of the net electric force they will exert on the proton is
Image

(a) $1.97 \times 10^{-8} N$
(b) $3.83 \times 10^{-8} N$
(c) $4.63 \times 10^{-8} N$
(d) $2.73 \times 10^{-8} N$

(iv) A charge is a property associated with the matter due to which it produces and experiences:
(a) electric effects only
(b) magnetic effects only
(c) both electric and magnetic effects
(d) non magnetic effects only

OR

The cause of quantization of electric charges is:
(a) transfer of an integral number of electrons
(b) transfer of an integral number of neutrons
(c) transfer of an integral number of protons
(d) transfer of an integral number of Atom
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Q 26Case study (4 Marks)4 Marks
Electrons oscillating in a circuit give rise to radiowaves. A transmitting antenna radiates most effectively the radiowaves of wavelength equal to the size of the antenna. The infrared waves incident on a substance set into oscillation all its electrons, atoms and molecules. This increases the internal energy and hence the temperature of the substance.

(i) If $v _{ g }, v _{ X }$ and $v _{ m }$ are the speeds of gamma rays, X -rays and microwaves respectively in vacuum, then
(a) $v_g>v_X>v_m$ (b) $v_g<v_X<v_m$ (c) $v_g>v_X>v_m$ (d) $v_g=v_X=v_m$

(ii) Which of the following will deflect in electric field?
(a) ultraviolet rays (b) $\gamma$-rays (c) X-rays (d) cathode rays

(iii) $\gamma$-rays are detected by
(a) point contact diodes (b) ionization chamber (c) thermopiles (d) photocells

OR

We consider the radiation emitted by the human body. Which one of the following statements is true?
i. The radiation emitted is in the infrared region.
ii. The radiation is emitted only during the day.
iii. The radiation is emitted during the summers and absorbed during the winters.
iv. The radiation emitted lies in the ultraviolet region and hence it is not visible.
(a) Option (iv) (b) Option (ii) (c) Option (iii) (d) Option (i)

(iv) The frequency of electromagnetic wave, which best suited to observe a particle of radius $3 \times 10^{-4} cm$ is the order of
(a) $10^{14} Hz$
(b) $10^{12} Hz$
(c) $10^{13} Hz$
(d) $10^{15} Hz$
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