Mechanics
Vector Algebra
MCQ (Single Correct Answer)Circular Motion
MCQ (Single Correct Answer)Simple Harmonic Motion
MCQ (Single Correct Answer)Gravitation
MCQ (Single Correct Answer)Electricity
Electromagnetic Waves
MCQ (Multiple Correct Answer)Optics
Wave Optics
MCQ (Single Correct Answer)Modern Physics
Electronic Devices
MCQ (Single Correct Answer)1
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
If the half-life of a radioactive nucleus is 3 days, nearly what fraction of the initial number of nuclei will decay on the third day? (Given, $$\root 3 \of {0.25} \approx 0.63$$)
2
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
An electron accelerated through a potential of 10000 V from rest has a de-Broglie wave length $$\lambda$$. What should be the accelerating potential, so that the wavelength is doubled?
3
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
The de-Broglie wavelength of an electron is $$0.4 \times {10^{ - 10}}$$ m when its kinetic energy is 1.0 keV. Its wavelength will be $$1.0 \times {10^{ - 10}}$$ m, when its kinetic energy is
4
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Radon-222 has a half-life of 3.8 days. If one starts with 0.064 kg of radon-222 left after 19 days will be
Questions Asked from MCQ (Single Correct Answer)
WB JEE Subjects
Physics
Mechanics
Electricity
Chemistry
Physical Chemistry
Inorganic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry