Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
The unit of thermal conductivity is:
The electric potential at a point in free space due to a charge $Q$ coulomb is $Q \times 10^{11}$ V. The electric field at that point is:
Which is the correct thermal stability order for $H_2E$ (E = O, S, Se, Te and Po)?
Joule-second is the unit of:
Which of the following statements is correct?
The velocity $v$ of a particle at time $t$ is given by $v = at + \frac{b}{t+c}$, where $a$, $b$ and $c$ are constants. The dimensions of $a$, $b$ and $c$ are respectively:
The angle of $1'$ (minute of an arc) in radian is nearly equal to:
Two metal spheres, one of radius $R$ and the other of radius $2R$ respectively have the same surface charge density $\sigma$. They are brought in contact and separated. What will be the new surface charge densities on them?
A Screw Gauge gives the following readings when used to measure the diameter of a wire. Main scale reading = $0.0\text{ mm}$ Circular scale reading = $52\text{ divisions}$ Given that: $1\text{ mm}$ on the main scale corresponds to $100\text{ divisions}$ of the circular scale. The diameter of the wire from the above data is:
Dimensions of resistance in an electrical circuit, in terms of dimension of mass $M$, length $L$, time $T$, and current $I$, would be:
A capillary tube of radius $r$ is immersed in water and water rises in it to a height $h$. The mass of the water in the capillary is 5 g. Another capillary tube of radius $2r$ is immersed in water. The mass of water that will rise in this tube is:
The variation of electrostatic potential with radial distance $r$ from the centre of a positively charged metallic thin shell of radius $R$ is given by the graph:
A monochromatic light of frequency 500 THz is incident on the slits of Young's double slit experiment. If the distance between the slits is 0.2 mm and the screen is placed at a distance 1 m from the slits, the width of 10 fringes will be:
Electron volt is a unit of
Which one has the dimensions different from the remaining three?
An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is, (nearly) : ($m_e = 9 \times 10^{-31}$ kg)
The units of angular momentum are:
Given below are two statements: Assertion (A): A glass tube partially filled with water represents an open organ pipe. Reason (R): The open end corresponds to an antinode and the end in contact with water, to a node. In the light of the above statements, choose the correct answer from the options given below:
A screw gauge has the least count of $0.01\text{ mm}$ and there are $50$ divisions in its circular scale. The pitch of the screw gauge is:
Name the enzyme that facilitates opening of DNA helix during transcription.