List of top Physics Questions

An object is placed in front of a convex lens of focal length 12 cm. If the size of the real image formed is half the size of the object, then the distance of the object from the lens is:
100 joules of heat is produced each second in a 4 ohm resistance. Potential difference across the resistor is:
In a simple pendulum experiment, a student calculates the value of \( g = 9.92 \, \text{m/s}^2 \), but the standard value of \( g \) is \( 9.80 \, \text{m/s}^2 \). Then the percentage error in the calculation of \( g \) is:
A spherical mirror and a thin spherical lens each have a focal length of \( -15 \, \text{cm} \). The nature of the mirror and lens will be:
A sound wave has a frequency of 500 Hz and wavelength 80 cm. How long will it take to travel 1 km?
A stone is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of \( 10 \, \text{m/s}^2 \), with what velocity and after what time will it strike the ground?
Two equal forces of 300 Newton each acting at an angle of 60°, the resultant will be
A person travels towards North by 4 m and then turns to West and travels by 3 m. The distance and displacements from initial point are
Modulus of rigidity of a liquid is
Least count of vernier calipers is 0.01 cm. Measuring the length of an object reading of main scale is 2.7 cm and the fifth division of vernier scale coincide with any division of main scale. The length of object will be
Zener diode is used as an
Water falls from 100 metre height. What will be temperature rise per kg of water due to fall?
\(g = 10 \, \text{m/s}^2\), specific heat of water = 4200 Joule/kg°C
A sphere of 150 kg is kept on frictionless surface. A bullet of 0.15 kg mass with velocity 200 m/sec strikes the sphere and stops. After collision the velocity of sphere will be
Electrical conductivity of a semiconductor
Balance the equation
\[ {}^9_4\text{Be} + {}^4_2\text{He} \rightarrow {}^6_12\text{C} + \cdots \]
The material of permanent magnet has
The order of radius of the nucleus of an atom is
If velocity of light in air is \(3 \times 10^8\) m/s and that in water is \(2 \times 10^8\) m/s, then what would be the critical angle?
A man can see upto 5 metre clearly. To see clear upto 10 m, the focal length of lens will be
Two springs with spring constants \(K_1 = 1500 \, \text{N/m}\) and \(K_2 = 3000 \, \text{N/m}\) are stretched by the same force. The ratio of potential energy stored in spring will be
A cycle tyre bursts suddenly. This represents an
Length of a rod increases 0.2% on increasing the temperature by 100°C. The value of coefficient of linear expansion of material of rod is
A force is applied on a 6 gm mass (at rest) for 20 seconds. After no force is exerted on it and after travelling distance of 50 cm in 5 seconds, mass stops. The amount of force in Newton will be
When \(10^{14}\) electrons are removed from a neutral metal sphere, the charge on the sphere becomes
In a 10 cm long horizontal wire, 5 Amp current is flowing. The mass of the wire is \(3 \times 10^{-3}\) kg/m. What will be the field to keep wire stable?