Physics Test - ...

If a liquid does not wet glass, its angle of contact is ______.

Two small charged spheres \(\mathrm{A}\) and \(\mathrm{B}\) have charges \(10 \mathrm{\mu C}\) and \(940 \mathrm{\mu C}\), respectively, and are held at a separation of \(90 \mathrm{~cm}\) from each other. At what distance from \(\mathrm{A}\) would the electric intensity be zero?

Two batteries A and B connected in given circuit have equal emfs E and internal resistances r₁ and r₂, respectively (r₁ > r₂).

The switch S is closed at t = 0. After a long time, it was found that terminal potential difference across battery A is zero. Find the value of R.

To light, a \(50 \mathrm{~W}, 100 \mathrm{~V}\) lamp is connected, in series with a capacitor of capacitance \(\frac{50}{\pi \sqrt{x}} \mu \mathrm{F}\), with \(200 \mathrm{~V}, 50 \mathrm{~Hz}\) AC source. The value of \(\mathrm{x}\) will be _____________.

If \(R, C\) and \(L\) denote resistance, capacitance, and inductance. Which of the following will not have the dimensions of frequency?

Charge on α-particle is how many times the charge on proton:

The variation of potential energy of harmonic oscillator is as shown in figure. The spring constant is:

By which quantities of the following is pressure measured?

The astronomical phenomenon when the planet Venus passes directly between the Sun and the earth is known as Venus transit. For two separate persons standing on the earth at points \(\mathrm M\) and \(\mathrm N\), the Venus appears as black dots at points \(\mathrm M^{\prime}\) ' and \(\mathrm N^{\prime}\) on the Sun. The orbital period of Venus is close to 220 days. Assuming that both earth and Venus revolve on circular paths and taking distance \(\mathrm {M N}=1000 \mathrm{~km}\), calculate the distance \(\mathrm{M^{\prime} N^{\prime}}\) on the surface of the Sun. [Take \(\left.(2.75)^{1 / 3}=1.4\right]\)