1. A shell of mass 20 g is fired by a gun of mass 100 kg. If the shell leaves the gun with a speed of 80 m $s^{-1}$. the speed of recoil of the gun is

COMEDK 2014 Laws Of Motion

2. One kilowatt hour is equal to

AIPMT 1997 Current Electricity

3. The aperture of objective lens of a telescope is made large so as to

KCET 2003 Ray Optics And Optical Instruments

4. In open organ pipe, if fundamental frequency is n, then the other frequencies are

Bihar CECE 2005 Electromagnetic Waves

5. At a point A on the earth's surface the angle of dip. $\delta$= +25°. Ata point Bon the earth's surface the angle of dip, 5= -25°. We can interpret that:

NEET 2019 Magnetism And Matter

6. The following figure shows a logic gate circuit with two inputs A and B and the output C .The voltage waveforms of A, B and C are as shown below.The logic circuit gate is

AIPMT 2006 Semiconductor Electronics: Materials Devices And Simple Circuits

7. 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

8. A small object of uniform density rolls up a curved surface with an initial velocity v. It reaches up to a maximum height of $\frac{3v^2}{4g}$ with respect to the initial position. The object is

AIPMT 1989 System Of Particles And Rotational Motion

9. When interference is observed, energy is

COMEDK 2005 Wave Optics

10. A reference frame attached to the earth

IIT JEE 1986 Laws Of Motion

11. Consider the junction diode as ideal. The value of current flowing through AB is :

NEET 2016 Semiconductor Electronics: Materials Devices And Simple Circuits

12. From the figure find the capacitance of the capacitor?

AIIMS 2001 Electrostatic Potential And Capacitance

13. Which of the following statement is correct?

AIPMT 1997 Dual Nature Of Radiation And Matter

14. Near and far points of human eye are

Punjab PMET 2005 Ray Optics And Optical Instruments

15. When a wave undergoes refraction

J & K CET 2009 Electromagnetic Waves

16. Match the elements of table I and table II. $\quad$$\quadTable I \quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad Table II 1.\quad Myopia\quad$$\quad$$\quad$$\quad$$\quad (i) \quadBifocal lens 2. \quadHypermetropia\quad$$\quad$ (ii) $\quad$Cylindrical lens 3. $\quad$Presbyopia$\quad$$\quad$$\quad$$\quad (iii) \quadConcave lens 4.\quad Astigmatism\quad$$\quad$$\quad$$\quad$ (iv)$\quad$ Convex lens

AIIMS 2000 Ray Optics And Optical Instruments

17. The kinetic energy of one mole gas at 300 K temperature, is E. At 400 K temperature kinetic energy is E'. The value of E'/ E is

Rajasthan PMT 2004 Kinetic Theory

18. Which of the following is not the property of cathode rays?

AIPMT 2002 Dual Nature Of Radiation And Matter

19. Two bodies are thrown up at angles of 40$^{\circ}$ and 60$^{\circ}$ respectively, with the horizontal. If both bodies attain same vertical height, then ratio of velocities with which these are thrown is

Delhi UMET 2005 Motion In A Plane

20. The earth of mass is $6 \times 10^{24}$ kg revolves around the sun with an angular velocity of $2 \times 10^{-7}\, rads^{-1}$ in a circular Q orbit of radius $15 \times 10^8$ km. The force exerted by the sun on earth is

Punjab PMET 2003 Motion In A Plane

21. Assertion: Moment of inertia is always constant. Reason: Angular moment is conserved that is why moment of inertia is constant.

AIIMS 2013 System Of Particles And Rotational Motion

22. If a ray of light in denser medium strikes a rarer medium at an angle of incidence i, the angle of reflection and refraction are respectively r and r', if the reflected and refracted rays are at right angles to each other, the critical angle for the given pair of media is

KCET 2003 Wave Optics

23. A piano convex lens is made of glass of refractive index n and R is radius of curvatur of curved surface. Its curved surface is silvered. It behaves as

COMEDK 2006 Ray Optics And Optical Instruments

24. Most of the substances show which of the magnetic property

JIPMER 2012 Magnetism And Matter

25. A ball which is at rest is dropped from a height h metre. As it bounces off the floor its speed is 80% of what is just before touching the ground. The ball will then rise to nearly a height

KEAM 2005 Motion In A Straight Line

26. Antimony and Bismuth are usually used in thermocouple, because

AIIMS 2001 Current Electricity

27. Equation of progressive wave is given by $y=a \, \sin\,\pi(40t-x)$ where a and x are in metre and t in second. The velocity of the wave is (m/s)

KCET 2000 Oscillations

28. A body is moved in straight line by machine with constant power. The distance travelled by it in time duration t is proportional to

AIIMS 2009 Work, Energy And Power

29. If a white light incident on the interface of glass and air as shown in figure and green light is just totally internally reflected, then the emerging ray in air contains

AIIMS 1980 Ray Optics And Optical Instruments

KCET 2011 Atoms