MCQ
In a wheatstone bridge in the battery and galvanometer are interchanged then the deflection in galvanometer will:
  • A
    Change in previous direction.
  • B
    Not change.
  • C
    Change in opposite direction.
  • D
    None of these.

Answer

  1. Not change.

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

Two point charges of the same polarities are hung with the help of two threads and kept close. The angle between the threads will be _________ if the system is taken to space.

If work function of metal is 3eV then threshold wavelength will be

(a) 4125 Å

(b) 4000 Å

(c) 4500 Å

(d) 5000 Å

A polariser is used to

(a) Reduce intensity of light

(b) Produce polarised light

(c) Increase intensity of light

(d) Produce unpolarised light

Let E1​ and E2​ be the binding energies of two nuclei A and B. It is observed that two nuclei of A combine together to form a B nucleus. This observation is correct only if:
In a charged capacitor, the energy is stored in:

With respect to air critical angle in a medium for light of red colour [  is q. Other facts remaining same, critical angle for light of yellow colour []  will be

(a) θ

(b) More than θ

(c) Less than θ

(d)  

Assertion  :   Current is passed through a metallic wire, heating it red. When cold water is poured on half of its portion, then rest of the half portion become more hot.  

Reason    : Resistances decreases due to decrease in temperature and so current through wire increases.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

A block of mass M is hanging over a smooth and light pulley through a light string. T he other end of the string is pulled by a constant force F. The kinetic energy of the block increases by 20J in 1s.
  1. The tension in the string is Mg.
  2. The tension in the string is F.
  3. The work one by the tension on the block is 20J in the above 1s.
  4. The work done by the force of gravity is -20J in the above 1s.
The equation →∑e = ∑IR is applicable to which law?
Consider aiming a beam of free electrons towards free protons. When they scatter, an electron and a proton cannot combine to produce a H-atom: