List of top Physics Questions

Heat required to raise temperature of 2 kg substance by 5°C is 1000 J. Specific heat is:

A rod of length 1 m expands by 1 mm when temperature increases by 100°C. Coefficient of linear expansion is:

A 100 g metal at 80°C is placed in 100 g water at 20°C. Final temperature is 40°C. Find specific heat of metal.

A liquid flows with velocity $2$ m/s through a pipe of diameter $0.01$ m. Density = $1000$ kg/m$^3$, viscosity = $0.5$ kg/m$\cdot$s. Reynolds number is:

A soap bubble of radius $1$ cm has surface tension $0.03$ N/m. Excess pressure inside is:

A pipe has cross-sectional areas $4$ cm$^2$ and $1$ cm$^2$. If velocity in the wider section is $2$ m/s, velocity in the narrower section is:

Water flows in a horizontal pipe. At a point where speed is $2$ m/s, pressure is $2000$ Pa. At another point, speed becomes $4$ m/s. Find pressure at second point. (Density $= 1000$ kg/m$^3$)

A wire extends by $1$ mm under $100$ N. Extension under $300$ N is:

Pressure of $2 \times 10^6$ Pa causes volume decrease of $0.1\%$ in a material. Bulk modulus is:

Consider the following:
a) 0.0025
b) 500.0
c) 2.0034
Number of significant figures in A, B and C respectively are

A wire is stretched by \( 2 \) mm under force \( 100 \) N. Elastic energy stored is:

A wire of length \( 2 \) m and area \( 1 \times 10^{-6} \, m^2 \) stretches by \( 1 \) mm under force \( 200 \) N. Young's modulus is:

A mass \( m \) is taken from Earth's surface to infinity. Work done is:

At what depth inside Earth does \(g\) become half of its surface value? (Earth radius \(=R\))

Escape velocity on a planet is \(10\ \text{km/s}\). If the radius remains same but the mass becomes \(4\) times, the new escape velocity is:

Boat speed \(=5\ \text{m/s}\), river speed \(=3\ \text{m/s}\), width \(=40\ \text{m}\). Minimum time?

Vectors of magnitude \(3\) and \(4\) are perpendicular. Resultant?

A projectile is projected with speed \(20\ \text{m/s}\) at an angle of \(30^\circ\). The range is \((g=10\ \text{m/s}^2)\):

A car moving at \(20\ \text{m/s}\) comes to rest with a uniform retardation of \(5\ \text{m/s}^2\). The stopping distance is:

A body starts from rest and accelerates uniformly at \(2\ \text{m/s}^2\). The distance covered in \(5\ \text{s}\) is:

Two cars move in the same direction with velocities \(20\ \text{m/s}\) and \(30\ \text{m/s}\). The velocity of one car relative to the other is:

The velocity-time graph of a particle is given by \(v=4t\). The acceleration is:

A particle moves such that its velocity-time graph is a straight line from \(0\ \text{m/s}\) at \(t=0\) to \(20\ \text{m/s}\) at \(t=10\ \text{s}\). The displacement in \(10\ \text{s}\) is:

A screw gauge has pitch \(=0.5\ \text{mm}\) and number of divisions on circular scale \(=50\). Find least count.

The measured value of a quantity is \(98\) units, while the true value is \(100\) units. The percentage error is: