Question
Assertion : Mass, length and time are fundamental physical quantities.
Reason : They are independent of each other.

Answer

(a) As length, mass and time represent our basic scientific notations, therefore they are called fundamental quantities and they cannot be obtained from each other.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Assertion : The instantaneous power of an agent is measured as the dot product of instantaneous velocity and the force acting on it at that instant.
Reason : The unit of instantaneous power is watt.
Assertion : When capacitive reactance is smaller than the inductive reactance in $L C R$ current, e.m.f. leads the current .
Reason : The phase angle is the angle between the alternating e.m.f. and alternating current of the circuit.
Assertion : The mirrors used in search lights are parabolic and not concave spherical.
Reason : In a concave spherical mirror the image formed is always virtual.
Assertion : Out of three measurements $I=0.7 m$; $=0.70 m$ and $I=0.700 m$, the last one is most accurate.
Reason : In every measurement, only the last significant digit is not accurately known.
Assertion : The dominant mechanism for motion of charge carriers in forward and reverse biased silicon $P-N$ junction are drift in both forward and reverse bias.
Reason : In reverse biasing, no current flow through the junction.
Assertion : Hot soup tastes better than the cold soup.
Reason : Hot soup has high surface tension and it does not spread properly on our tongue.
Assertion : Only a change in magnetic flux will maintain an induced current the coil.
Reason : The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous.
Assertion : The heat supplied to a system is always equal to the increase in its internal energy.
Reason : When a system changes from one thermal equilibrium to another, some heat is absorbed by it.
Assertion : Greater is the coefficient of thermal conductivity of a material, smaller is the thermal resistance of a rod of that material.
Reason : Thermal resistance is the ratio of temperature difference between the ends of the conductor and rate of flow of heat.
Assertion : If an earth satellite moves to a lower orbit, there is some dissipation of energy but the satellite speed increases.
Reason : The speed of satellite is a constant quantity.