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Explore Class 12 Physics past and model questions by chapter, year, marks and question type.
478 questions found
In which of the following processes of the gas, work done is the maximum?
Isothermal
Isobaric
adiabatic
Isochoric
Which one of the following properties of sound is affected by the change in air temperature?
amplitude
frequency
wavelength
intensity
Two wave pulses travel toward each other as shown in the diagram below.
Which of the following diagrams represents the superposition of the pulses when they meet?
What percentage of original radioactive atoms is left after 4 half-lives?
$1%$
$6%$
$10%$
What correction is made by Laplace over the Newton's formula for velocity of sound in a gas? Obtain the corrected formula.
What will be the effect of velocity of transverse wave in a stretched string if the radius of the string is doubled?
If the rotational kinetic energy of a body is E and moment of inertia is I, then angular momentum will be:
EI
√2EI
E/I
√IE
The displacement versus time graph of particles in SHM is shown in figure. The maximum velocity of the particle is:
1 cm s⁻¹
0.2 cm s⁻¹
3.14 cm s⁻¹
31.4 cm s⁻¹
Two capillary tubes P and Q of radii 4 mm and 2 mm are dipped in water. What is the ratio of heights through which liquid rises in the tubes P and Q?
1:2
2:1
1:4
4:1
A system undergoes an isochoric process so that its temperature changes from 127°C to 227°C. What is the ratio of initial pressure to final pressure?
4/5
5/4
227/127
127/227
Given figure represents the block diagram of a heat engine. What is the efficiency of this engine?
25%
50%
60%
75%
Which of the following is the ferromagnetic material?
Aluminium
Gold
Copper
Cobalt
The temperature of inversion of a thermocouple is 600°C and the neutral temperature is 310°C. What must be the temperature of cold junction?
0°C
10°C
20°C
30°C
If a P-wave were to go from a solid to a liquid, what would happen to its velocity?
Remains the same
Increases
Decreases
Decreases up to zero
N identical spherical drops of water falling with a terminal velocity v₁ coalesce to form a bigger drop and fall with a new terminal velocity v₂ through air. (Neglect air resistance.)
i) Obtain a relation between v₂ and v₁. [2]
ii) If N = 2 and v₁ = 0.4 m s⁻¹, then calculate v₂. [1]
An ion of specific charge 4.40 × 10⁷ C/kg is moving in a circular orbit in a magnetic field of flux density 0.4 T with velocity of 3.52 × 10⁵ m s⁻¹. Calculate the radius of this orbit.
A car is sounding its horn and has a frequency 400 Hz and travelling towards a stationary traffic post. A traffic police at the post detects the change in frequency of 60 Hz when the car crosses him. Find the velocity of the car.
(Velocity of sound in air is 340 m s⁻¹)
A monochromatic light of wavelength 5890 Å is incident normally on a diffraction grating which has 6000 lines per centimeter.
i) At what angle will the second order image be seen?
ii) Is third order image possible with this grating?
State Faraday's laws of electromagnetic induction. The magnetic flux passing perpendicular to the plane of a coil is given by
where φ is in weber and t is in seconds. Calculate the magnitude of instantaneous emf induced in the coil when t = 3 s.
How can a plane wavefront be converted into a spherical wavefront? Justify