SI Units — Set 3
Physics · SI इकाइयां · Questions 21–30 of 60
The SI unit of solid angle is the _____.?
Correct Answer: A. Steradian
The steradian is the SI unit for measuring solid angles in three-dimensional space. It is the 3D equivalent of the radian. A full sphere has a solid angle of 4π steradians.
Which of the following is the SI unit of conductance?
Correct Answer: B. Siemens
The siemens is the SI unit of electrical conductance and admittance. It is the reciprocal of the ohm. One siemens is equal to one ampere per volt.
What is the SI unit for the power of a lens?
Correct Answer: C. Dioptre
The dioptre is the unit used to express the optical power of a lens or curved mirror. It is equal to the reciprocal of the focal length measured in meters. A shorter focal length means a higher dioptre value.
The SI unit of dynamic viscosity is _____.?
Correct Answer: A. Pascal-second
The pascal-second is the SI unit for dynamic viscosity. It describes the internal friction of a fluid. One pascal-second is equivalent to ten poise.
Which of the following is the SI unit of molar entropy?
Correct Answer: A. Joule per mole-kelvin
The SI unit for molar entropy is joule per mole-kelvin. It measures the amount of disorder or randomness per mole of substance per unit temperature. Entropy is a fundamental concept in thermodynamics.
The SI unit of magnetic field strength is _____.?
Correct Answer: C. Ampere per meter
Ampere per meter is the SI unit used for magnetic field strength. It is distinct from magnetic flux density, which is measured in tesla. This unit relates to the current flowing through a conductor.
What is the SI unit of specific heat capacity?
Correct Answer: B. Joule per kilogram-kelvin
The SI unit of specific heat capacity is joule per kilogram-kelvin. It represents the energy required to raise the temperature of one kilogram of a substance by one kelvin. Every material has a unique specific heat capacity.
The SI unit of thermal conductivity is _____.?
Correct Answer: B. Watt per meter-kelvin
Watt per meter-kelvin is the SI unit used for thermal conductivity. It measures the ability of a material to conduct heat. Metals generally have higher thermal conductivity than non-metals.
Which unit is used to measure torque in the SI system?
Correct Answer: C. Newton-meter
The newton-meter is the SI unit for torque or moment of force. It represents the rotational effect produced by a force. While it has the same dimensions as the joule, it is rarely called a joule for torque.
The SI unit of surface tension is _____.?
Correct Answer: B. Newton per meter
Newton per meter is the SI unit of surface tension. It describes the force acting per unit length on the surface of a liquid. This property allows insects to walk on water.