1. The internal energy change in a system that has absorbed 2 kcal of heat and done 500 J of work is

AIPMT 2009 Thermodynamics

2. Three resistances each of $4\, \Omega$ are connected to form a triangle. The resistance between any two terminals is

AIPMT 1993 Current Electricity

3. A particle of mass m moves with constant speed along a circular path of radius r under the action of force F. Its speed is

AIIMS 2008 Motion In A Plane

WBJEE 2019 Atoms

5. In the given figure, a = 15 $m/s^2$ represents the total acceleration of a particle moving in the clockwise direction in a circle of radius R = 2.5 m at a given instant of time. The speed of the particle is -

NEET 2016 Motion In A Plane

6. In the circuit shown in figure, when the input voltage of the base resistance is $10\, V$, $V_{be}$ is zero and $V_{ce}$ is also zero. Value of $\beta$ is

AIIMS 2017 Semiconductor Electronics: Materials Devices And Simple Circuits

7. In forward bias, the width of potential barrier in a p-n junction diode

AIPMT 1999 Semiconductor Electronics: Materials Devices And Simple Circuits

8. The stress-strain curves are drawn for two different materials $X$ and $Y$. It is observed that the ultimate strength point and the fracture point are close to each other for material $X$ but are far apart for material $Y$. We can say that materials $X$ and $Y$ are likely to be (respectively)

NEET 2019 Mechanical Properties Of Solids

9. A proton and an $\alpha$-particle (with their masses in the ratio of 1:4 and charges in the ratio of 1:2) are accelerated from rest through a potential difference V. If a uniform magnetic field (B) is set up perpendicular to their velocities, the ratio of the radii $r_p : r_\alpha$ of the circular paths described by them will be :

JEE Main 2019 Moving Charges And Magnetism

10. When 1 kg of ice at $0^{\circ} C$ melts to water at $0^{\circ}C$ , the resulting change in its entropy, taking latent heat of ice to be 80 cal/$^{\circ}C, \, is$

AIPMT 2011 Thermodynamics

11. A body can be negatively charged by

AIIMS 1998 Electric Charges And Fields

12. Decimal number 53 is equal to binary number

KCET 1996 Semiconductor Electronics: Materials Devices And Simple Circuits

13. Pressure variation in a mechanical wave depends upon as

DUMET/DPMT/Delhi UMET 2008 Electromagnetic Waves

14. An ideal gas has molecules with $5$ degrees of freedom. The ratio of specific heats at constant pressure $(C_p)$ and at constant volume $(C_v)$ is :

JEE Main 2017 Kinetic Theory

15. Which of the following phenomena support the wave theory of light ? (a) scattering (b) interference (c) diffraction (d) velocity of light in a denser medium is less than the velocity of light in the rarer medium

KCET 2013 Wave Optics

16. Water is flowing in streamline motion through a horizontal tube. The pressure at a point in the tube is $p$ where the velocity of flow is $v$. At another point, where the pressure is $p/2$, the velocity of flow is [density of water = $ρ$]

WBJEE 2013 Mechanical Properties Of Fluids

17. Given in the figure are two blocks $A$ and $B$ of weight $20\,N$ and $100\,N$ respectively. These are being pressed against a wall by a force F as shown in figure. If the coefficient of friction between the blocks is $0.1$ and between block B and the wall is $0.15$, the frictional force applied by the wall in block B is

JEE Main 2015 Laws Of Motion

18. A body, constrained to move in y-direction, is subjected to a force given by $\overrightarrow{F} = (-2\widehat{i}+15\widehat{j}+6\widehat{k})$N The work done by this force in moving the body through a distance of 10$\widehat{j}$ m along y-axis, is

AIPMT 1994 Work, Energy And Power

19. Two coaxial solenoids of different radii carry current $I$ in the same direction. Let $\vec{F}_1$ be the magnetic force on the inner solenoid due to the outer one and $\vec{F}_2$ be the magnetic force on the outer solenoid due to the inner one. Then,

JEE Main 2015 Moving Charges And Magnetism

20. A wire, of length $L( \,= \,20 \,cm)$, is bent into a semi-circular arc. If the two equal halves, of the arc, were each to be uniformly charged with charges $\pm Q, [ | Q | = 10^3$ $\varepsilon_{0}$ Coulomb where $\varepsilon_{0}$ is the permittivity (in SI units) of free space] the net electric field at the centre $O$ of the semi-circular arc would be :

JEE Main 2015 Electric Charges And Fields

21. The density for simple cubic lattice is where A = atomic number, a = lattice parameter, N = Avogadro's number

Haryana PMT 2005 Semiconductor Electronics: Materials Devices And Simple Circuits

22. 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

23. If $x, v$ and $a$ denote the displacement, the velocity and the acceleration of a particle executing simple harmonic motion of time period $T$, then, which of the following does not change with time?

JIPMER 2013 Oscillations

24. If maximum energy is stored in capacitor at $t = 0$ then find the time after which current in the circuit will be maximum.

AIIMS 2019 Alternating Current

25. Two stones are thrown up simultaneously from the edge of a cliff $240\, m$ high with initial speed of $10\, m/s$ and $40\, m/s$ respectively. Which of the following graph best represents the time variation of relative position of the second stone with respect to the first? (Assume stones do not rebound after hitting the ground and neglect air resistance, take $g=10m/s^2$)

JEE Main 2015 Motion In A Plane

26. At time $t = 0$, activity of radioactive substance is 1600 Bq, at $t = 8$ s activity falls to 100 Bq. The activity at $t = 2$ s is

JIPMER 2013 Nuclei

27. A pendulum clock loses $12\,s$ a day if the temperature is $40^{\circ}C$ and gains $4\,s$ a day if the temperature is $20^{\circ}C$. The temperature at which the clock will show correct time, and the co-efficient of linear expansion $(\alpha)$ of the metal of the pendulum shaft are respectively :

JEE Main 2016 Thermal Properties Of Matter

28. The momentum of a photon of energy 1 Me V in kg $ms^{ - 1}$, will be

Haryana PMT 2008 Dual Nature Of Radiation And Matter

29. For a transparent medium relative permeability and permittivity, $\mu_ r$ and $\epsilon_{r}$ are $1.0$ and $1.44$ respectively. The velocity of light in this medium would be,

NEET 2019 Electromagnetic Waves

30. A can filed with water is revolved in a vertical circle of radius 4 m and the water does not fall down. The time period for a revolution is about

J & K CET 2010 Motion In A Plane