Practice questions
88551 published questions with worked solutions.
- A green light is incident from the water to the air-water interface at the critical angle ( ). Select the correct statement -
- A block of mass m is placed on a surface with a vertical cross section given by y = x^3 6 . If the coefficient of friction is...
- The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 10^3 A m^ -1 . The current required to be passed in...
- Two beams, A and B, of plane polarized light with mutually perpendicular planes of polarization are seen through a Polaroid. From...
- Assume that an electric field E = 30x^2 , i exists in space. Then the potential difference V_A - V_O, where V_O is the potential...
- Match List-I (Electromagnetic wave type) with List-II (Its association/application) and select the correct option from the...
- The current voltage relation of diode is given by I = (e^ 1000V/T - 1) mA, where the applied voltage V is in volts and the...
- A pipe of length 85 cm is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose...
- In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the...
- Four particles, each of mass M and equidistant from each other, move along a circle of radius R under the action of their mutual...
- From a tower of height H, a particle is thrown vertically upwards with a speed u. The time taken by the particle, to hit the...
- A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it?
- A parallel plate capacitor is made of two circular plates separated by a distance of 5 mm and with a dielectric of dielectric...
- A particle moves with simple harmonic motion in a straight line. In first s, after starting from rest it travels a distance a and...
- During the propagation of electromagnetic waves in a medium -
- Three rods of Copper, Brass and Steel are welded together to form a Y-shaped structure. Area of cross-section of each rod = 4...
- Hydrogen ( _1 H ^1), Deuterium ( _1 H ^2), singly ionised Helium ( _2 He ^4)^+ and doubly ionised lithium ( _3 Li ^6)^ ++ all...
- When a rubber-band is stretched by a distance x, it exerts a restoring force of magnitude F = ax + bx^2 where a and b are...
- A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1m 1000 times. Assume that the potential...
- A satellite is revolving in a circular orbit at a height 'h' from the earth's surface (radius of earth R; h << R). The minimum...