Class 10 Electricity CBSE Questions & Answers

Class 10 · Electricity

Class 10 Electricity CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

An electric device draws a current of 1.5 A and is kept on for 4 hours. What is the total charge that flows through this device?

A
None of these.
B
21500 coulomb
C
21650 coulomb
D
21600 coulomb
Correct

When two objects are rubbed together, one of the objects looses some of its free electrons while the other gains the same number of these free electrons. Which object gains the positive charge?

A
None of these
B
object loosing electron
Correct
C
Both of these
D
object gaining electron

The path of motion of tree electron in a metal is

A
parabolic
B
straight line
C
circular
D
zigzag
Correct

In a conductor, free electrons:

A
move towards the region of higher potential
Correct
B
move towards the region of equal potential
C
do not move at all.
D
move towards the region of lower potential

A unit charge is moved from a point A to another point B. The work done in the process is called

A
Potential at the point B
B
None of the above.
C
the potential difference between A and B
Correct
D
potential at the point A

Ohms law is not obeyed by

A
semiconductor diodes
B
Both electrolytes and semiconductor diodes.
Correct
C
alloys
D
electrolytes

Constantan or Magnanin are chosen for making standard resistances because of

A
low temp coefficient of resistance
Correct
B
all of the above factors.
C
production of least disturbance in the circuit due to less contact potential
D
high value of resistivity

A wire of resistance 2 $\Omega $ is bent to form a circle. What is the resistance between two diametrically opposite points?

A
$4\Omega $
B
$0.{\rm{5}}\Omega $
Correct
C
${\rm{1}}.{\rm{5}}\Omega $
D
${\rm{1}}\Omega $

How many electrons are there in – 10 C charge?

A
${\rm{6}}.{\rm{25 x1}}{0^{{\rm{18}}}}$
B
${\rm{6}}.{\rm{25 x1}}{0^{ - {\rm{18}}}}$
C
${\rm{6}}.{\rm{25 x1}}{0^{{\rm{19}}}}$
Correct
D
${\rm{6}}.{\rm{25 x1}}{0^{ - {\rm{19}}}}$

V – I graph for a metallic wire at two different temperature T1 and T2 as shown in the following figure. which of the two temperature is higher?

A
Temp T1
B
None of these.
C
TempT2
Correct
D
T1 = T2

A rod has a resistivity of 2x10-3 Ω m if its length is doubled and area is halved. What is the new resistivity.

A
${\rm{4}} \times {\rm{1}}{0^{ - {\rm{3}}}}$
B
${\rm{2}} \times {\rm{1}}{0^{ - {\rm{3}}}}$
C
remain the same
Correct
D
${\rm{8}} \times {\rm{1}}{0^{ - {\rm{3}}}}$

Statement A : Resistivity increases with decrease in temperature in insulators. , Statement B : Resistivity of a conductor increases with increasing temp.

A
Neither statement A nor statement B is true
B
Statement A is true, B is false
C
statement A is false, B is true
Correct
D
Both the statements A and B are true

Nichrome and copper wires of the same length and same radius are connected in series. Current I is passed through them. Which of the two get heated first?

A
copper wire
B
None of these
C
Nichrome wire
Correct
D
Both

Two resistance $1\Omega $ and $2\Omega $ are connected in series and then in parallel. The ratio of the effective resistance of series and parallel combination of resistance is

A
0.0430555555556
B
0.376388888889
Correct
C
0.125694444444
D
0.0895833333333

A heater joined in parallel with a 60w bulb is connected to the minus if the 60w bulbs is replaced by a 100w bulbs, the rate of heat produced by the heater be

A
less
B
more
Correct
C
None of these.
D
remain the same