HARD
JEE Main
IMPORTANT
Earn 100
The current voltage relation of diode is given by I = (e1000 V/T - 1) mA, where the applied voltage V is in volts and the temperature T is in degree Kelvin. If a student makes an error measuring while measuring the current of 5 mA at 300 K, what will be the error in the value of current in mA ?
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Important Questions on Physics and Measurement
EASY
JEE Main
IMPORTANT
Let denote the dimensional formula of the permittivity of vacuum. If M = mass, L = length, T = time and A = electric current, then :
MEDIUM
JEE Main
IMPORTANT
A beaker contains a fluid of density , specific heat and viscosity . The beaker is filled up to height h. To estimate the rate of heat transfer per unit area by convection when beaker is put on a hot plate, a student proposes that it should depend on , and when ( ) is the difference in the temperature between the bottom and top of the fluid. In that situation the correct option for is:
EASY
JEE Main
IMPORTANT
A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it ?
EASY
JEE Main
IMPORTANT
Identify the pair of physical quantities that have same dimensions:
EASY
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IMPORTANT
If , then the relative error in will be
EASY
JEE Main
IMPORTANT
For , where '' is a constant. If percentage error in measurement of '' and '' are and , respectively, then the percentage error for '' will be _____.
EASY
JEE Main
IMPORTANT
The dimension of mutual inductance is
MEDIUM
JEE Main
IMPORTANT
A travelling microscope is used to determine the refractive index of a glass slab. If 40 divisions are there in on main scale and Vernier scale divisions are equal to main scale divisions, then least count of the travelling microscope is _____ .
