Physics
A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

Greater than the weight of the man
Zero
Less than the weight of the man
Same as the weight of the man

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Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be greater than the diameter of the object.
None of these
Both A & B
The wavelength of the electrons must be close to the diameter of the object

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Physics
What is the direction of torque?

Parallel to the radius
Perpendicular to the direction of applied force
Opposite to the direction of applied force
Same as the direction of applied force

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