MCQ
Mark the incorrect statement.
  • A
    electric current produces magnetism.
  • B
    magnets can produce electric current.
  • C
    magnets can't produce electric current.
  • D
    a and b

Answer

  1. magnets can't produce electric current.

Explanation:

A magnet can generate electric current by the means of electromagnetic induction. When there is a relative motion between a coil and a magnet, the magnetic flux linked to the coil changes due to that relative motion. This change in magnetic flux will induce a current in the coil, which is known as induced current.

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

An element A decays into element C by a two step process :

A → B +  

B → C +  

Then

(a) A and C are isotopes

(b) A and C are isobars

(c) A and B are isotopes

(d) A and B are isobars

The radius of the orbital of electron in the hydrogen atom 0.5 Å. The speed of the electron is 2 . Then the current in the loop due to the motion of the electron is

(a) 1 mA 

(b) 1.5 mA

(c) 2.5 mA

(d) 1.5  

The potential gradient along the length of a uniform wire is 10 volt/metre.  B and C are the two points at 30 cm  and  60 cm point on a meter scale fitted along the wire. The potential difference between B  and  C will be

(a) 3 volt   

(b) 0.4 volt

(c) 7 volt

(d) 4 volt

If a star can convert all the He nuclei completely into oxygen nuclei. The energy released per oxygen nuclei is [Mass of He nucleus is 4.0026 amu and mass of Oxygen nucleus is 15.9994 amu]:

To draw maximum current from a combination of cells, how should the cells be grouped

(a) Series

(b)Parallel

(c) Mixed

(d) Depends upon the relative values of external and internal resistance

If the frequency of light in a photoelectric experiment is doubled, the stopping potential will:
  1. Be doubled.
  2. Be halved.
  3. Become more than double.
  4. Become less than double.
If there are 3 parallely connected cells of emf $\varepsilon_1=1.2 V, \varepsilon_2=1.4 V, \varepsilon_3=1.5 V$ and of internal resistances $r_1=0.1 \Omega, r_2=0.2 \Omega$ and $r_3=0.3 \Omega$, then find $\frac{\varepsilon_{e q}}{r_{e q}}=$ ___________ $V \Omega^{-1}$.
A pure semiconductor at absolute zero has:
Two lithium nuclei in a lithium vapour at room temperature do not combine to form a carbon nucleus because:

An X-ray has a wavelength of 0.010 Å. Its momentum is

(a) 2.126 × 10–23 kg-m/sec

(b) 6.626 × 10-22 kg-m/sec

(c) 3.456 × 20–25 kg-m/sec

(d) 3.313 ×  10–22 kg-m/sec