Physics questions
20027 published questions with worked solutions.
- An electric bulb rated as 100W – 220 V is connected to an ac source of rms voltage 220 V. The peak value of current through the...
- Using a battery, a 100 pF capacitor is charged to 60 V and then the battery is removed. After that, a second uncharged capacitor...
- A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6%, then the loss of power in units of...
- A solid steel ball of diameter 3.6 mm acquired terminal velocity 2.45 10^ -2 m/s while falling under gravity through an oil of...
- Pressure of an ideal gas, contained in a closed vessel, is increased by 0.4% when heated by 1°C. Its initial temperature must be:
- Two cells of emfs 1 V and 2 V and internal resistances 2 and 1 , respectively, are connected in series with an external...
- A physical quantity C is related to four other quantities p, q, r and s as follows C = pq^2 r^3 s . The percentage errors in the...
- Light from a point source in air falls on a spherical glass surface (refractive index, = 1.5 and radius of curvature = 50 cm)....
- The excess pressure inside a soap bubble A in air is half the excess pressure inside another soap bubble B in air. If the volume...
- Consider following statements for refraction of light through prism, when angle of deviation is minimum. A. The refracted ray...
- The radiation pressure exerted by a 450 W light source on a perfectly reflecting surface placed at 2 m away from it, is
- A person measures mass of 3 different particles as 435.42 g, 226.3 g and 0.125 g. According to the rules for arithmetic...
- During the melting of a slab of ice at 273 K at atmospheric pressure:
- The work function of a metal is 3 eV. The color of the visible light that is required to cause emission of photoelectrons is
- The electrostatic potential on the surface of uniformly charged spherical shell of radius R = 10 cm is 120 V. The potential at...
- A gas is kept in a container having walls which are thermally non-conducting. Initially the gas has a volume of 800 cm³ and...
- The radii of curvature for a thin convex lens are 10 cm and 15 cm respectively. The focal length of the lens is 12 cm. The...
- Two coherent monochromatic light beams of intensities 4I and 9I are superimposed. The difference between the maximum and minimum...
- A 4.0 cm long straight wire carrying a current of 8 A is placed perpendicular to a uniform magnetic field of strength 0.15 T. The...
- When an object is placed 40 cm away from a spherical mirror an image of magnification 1 2 is produced. To obtain an image with...