Download App

Current Electricity — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsCurrent Electricity1 Mark
MCQ
Two non-ideal batteries are connected in parallel. Consider the following statements:
  1. The equivalent emf is smaller than either of the two emfs.
  2. The equivalent internal resistance is smaller than either of the two internal resistances.
  • A
    Both A and B are correct.
  • B
    A is correct but B is wrong.
  • C
    B is correct but A is wrong.
  • D
    Both A and B are wrong.
✓

Answer

  1. B is correct but A is wrong.

Explanation:

Equivalent emf $\in_0=\frac{\in_1\text{r}_1+\in_2\text{r}_2}{\text{r}_1+\text{r}_2}$

Equivalent resistance $=\text{r}_0=\frac{\text{r}_1\text{r}_2}{\text{r}_1+\text{r}_2}$

$\phi$ The equivalent emf is smaller than either of the two emfs.

$\phi$ The equivalent internal resistance is smaller than either of the two internal resistances.

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

Explore more

More "M.C.Q (1 Marks)" from Current Electricity→Current Electricity — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

O2 molecule consists of two oxygen atoms. In the molecule, nuclear force between the nuclei of the two atoms:
→

Choke coil works on the principle of

(a) Transient current

(b)  Self induction

(c) Mutual induction

(d) Wattless current
→
If the binding energy per nucleon for 3​Li7 is 5.6MeV, the total binding energy of a lithium nucleus is?
→

The resistance of a galvanometer is 25 ohm and it requires 50μA for full deflection. The value of the shunt resistance required to convert it into an ammeter of 5 amp is

(a) 2.5  

(b) 1.25  

(c) 0.05 ohm

(d) 2.5 ohm
→
In the Geiger-Marsden scattering experiment, is case of head-on collision the impact parameter should be:
→
The rms speed of oxygen molecules in a gas is v. If the temperature is doubled and the oxygen molecules dissociate into oxygen atoms, the rms speed will become:
  1. $\text{v}$
  2. $\text{v}\sqrt{2}$
  3. $2\text{v}$
  4. $4\text{v}$
→

Image is formed for the short sighted person at

(a) Retina 

(b) Before retina 

(c) Behind the retina 

(d) Image is not formed at all 
→

Assertion :  In everyday life the Doppler’s effect is observed readily for sound waves than light waves.

Reason     : Velocity of light is greater than that of sound.

(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.

→

To demonstrate the phenomenon of interference, we require two sources which emit radiation

(a) Of the same frequency and having a define phase relationship

(b) Of nearly the same frequency

(c) Of the same frequency

(d) Of different wavelengths
→
In a hydrogen atom, which of the following electronic transitions would involve the maximum energy change:
→