## 1. In a Young’s double slit experiment the intensity of light when slit is at distance $\lambda$ from central is I. What will be the intensity at the distance of slit is $\frac{\lambda}{6}$ ?

AIIMS 2014 Wave Optics

## 2. In a pure semiconductor crystal, if current flows due to breakage of crystal bonds, then the semiconductor, is called

AIIMS 1997 Semiconductor Electronics: Materials Devices And Simple Circuits

## 3. Velocity of sound in air is 320m/s. A pipe closed at one end has a length of 1 m. Neglecting end corrections, the air column in the pipe can resonate for sound of frequency

IIT JEE 1989 Waves

## 4. A luminous object is separated from a screen by a distance D. What is the greatest focal length a lens could have to focus the object on the screen ?

KCET 2001 Ray Optics And Optical Instruments

## 5. A current of $6 \, A$ enters one corner $P$ of an equilateral triangle $PQR$ having 3 wires of resistances 2 $\Omega$ each and leaves by the corner $R$. Then the current $I_1$ and $I_2$ are

KCET 2006 Current Electricity

## 6. In the circuit shown in the figure, there are two parallel plate capacitors each of capacitance C. The switch $S_1$ is pressed first to fully charge the capacitor $C_1$ and then released. The switch $S_2$ is then pressed to charge the capacitor $C_2.$ After some time, $S_2$ is released and then $S_3$ is pressed. After some time

JEE Advanced 2013 Electrostatic Potential And Capacitance

## 7. An atom bomb is based on the principle of

JIPMER 2011 Nuclei

## 8. Assertion: In an SHM, kinetic and potential energies become equal when the displacement is 1/$\sqrt{2}$times the amplitude. Reason : In SHM, kinetic energy is zero when potential energy is maximum.

AIIMS 2018 Oscillations

## 9. Water is heated from 0 $^\circ$C to 10 $^\circ$C. then its volume

KCET 2015 Thermal Properties Of Matter

## 10. A particle is projected with velocity 100 mis at 30°. Time of flight is

COMEDK 2006 Motion In A Plane

## 11. In a transformer number of turns in primary circuit is 500 and in secondary circuit number of turns is 10 and load resistance is 10 $\Omega$ and voltage of secondary coil is 50 V then find the current in primary circuit.

AIIMS 2019 Alternating Current

## 12. The incidents light has intensity $I$ and the number of electrons emitted per second is $N$. Then the maximum kinetic energy of emitted electrons per second is $K$. If the intensity of the incidents light is doubled, then the number of electrons emitted per second and the maximum kinetic energy respectively are

JIPMER 2014 Dual Nature Of Radiation And Matter

## 13. How long will a passenger sitting at the window of a train travelling at a speed of 54 km$h^{-1}$ see a train,passing by in the opposite direction with a speed of 36 km$h^{-1}$ , if the length of the second train is 150 m?

Haryana PMT 2005 Motion In A Plane

## 14. The wrong unit conversion among the following is

KEAM 2015 Physical World, Units and Measurements

## 15. The moment of inertia of a disc of mass M and radius R about an axis which is tangential to the circumference of the disc and parallel to its diameter, is

AIIMS 1995 System Of Particles And Rotational Motion

## 16. Assertion : Faraday's laws are consequences of conservation of energy. Reason : In a purely resistive A.C. circuit, the current lags behind the e.m.f. in phase.

AIIMS 2002 Alternating Current

## 17. A bulb is kept at a depth h inside water of refractive index $' n'$. Area of the bright patch on the water surface is

COMEDK 2007 Ray Optics And Optical Instruments

## 18. When the axis of rotation passes through its centre of gravity, then the moment of inertia of a rigid body is

AIIMS 1996 System Of Particles And Rotational Motion

## 19. The electric potential at the surface of an atomic nucleus (Z = 50) of radius $9 \times 10^{ - 15} \, m$ is

Gujarat CET 2006 Electrostatic Potential And Capacitance

AIPMT 2011 Waves

## 21. The charge q is projected into a uniform eiectric field E, work done when it moves a distance y is

Odisha JEE 2009 Electrostatic Potential And Capacitance

## 22. A body is thrown up with a speed u, at an angle of projection $\theta$. If the speed of the projectile becomes$\frac{u}{\sqrt{2}}$ on reaching the maximum height, the maximum vertical height attained by the projectile i

KEAM 2016 Motion In A Plane

## 23. If there are only one type of charge in the universe, then ($\vec{E} \to$ Electric field, $\vec{ds} \to$ Area vector)

KCET 2016 Electric Charges And Fields

## 24. Two bars of radius r and 2rare kept in contact as shown. An electric current I is passed through the bars. Which one of following is correct ?

IIT JEE 2006 Current Electricity

## 25. Carbon dating is best suited for determining the age of fossils if their age in years is of the order of

AIIMS 2004 Nuclei

## 26. Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV then the de-Broglie wavelength associated with the electrons would

AIPMT 2011 Dual Nature Of Radiation And Matter

AIIMS 1998 Waves

## 28. Assertion : The resistance of a junction of a spoiled transistor is low when forward biased or reverse biased. Reason : The resistance of a junction of a transistor in working order is high always.

AIIMS 2014 Semiconductor Electronics: Materials Devices And Simple Circuits

## 29. The kinetic energy of an electron, which is accelerated in the potential difference of 100 V, is

JIPMER 2010 Electrostatic Potential And Capacitance

## 30. A soap bubble exhibits brilliants colours due to

JIPMER 2014 Wave Optics