Physics Test 206

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Physics Test 206

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Weekly Quiz Competition

Question 1
4 / -1

For any charge configuration, equipotential surface through a point is _____to the electric field at that point.

A
Perpendicular

B
At 45 degrees

C
Anti-parallel.

D
Parallel

Solution

Definition based
Question 2
4 / -1

According to ‘plum pudding model’ atoms on the whole are electrically neutral because

A
positive charge is concentrated at one place and negative charge is elsewhere.

B
the negative charge of the atom is uniformly distributed throughout the volume of the atom and the positively charged electrons are embedded in it

C
the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons are embedded in it

D
the positive charge of the atom is uniformly distributed throughout the volume of the electron and the negative charge of electrons balances positive parts

Solution

The plum pudding model is one of several scientific models of the atom. According to J.J. Thomson atomic models the positive particles in the atom form something like the "batter" in a plum pudding, while the negative electrons are scattered through this "batter".
Question 3
4 / -1

What is the electric potential of the system?

A

B

C
Zero

D

Solution
Question 4
4 / -1

The amount of force exerted on a unit positive charge in an electric field is known as _____

A
Electric field intensity

B
Electric flux

C
Electric potential

D
Electric lines of force

Solution

The zone near a charge where its attraction or repulsion force works, is known as the electric field of that charge. Theoretically, it is up to infinite but practically it has limitations. If a unit positive charge is kept in that field, it will undergo some force which is known as electric field intensity at that point.
Question 5
4 / -1

The nuclide ₉₂U²³⁸ has all the following except

A
92 protons

B
146 neutrons

C
238 nucleons

D
92 neutrons

Solution

The nuclide (nucleus) consists of neutrons and protons (when combined called nucleons).

Thus,

No. of protons in 92U²³⁸ = 92,

No. of neutrons = 146 (238 – 92)

No. of nucleons = 238 (146 + 92)
Question 6
4 / -1

1 ampere current is equivalent to

A
6.25×10¹⁸ electrons s⁻¹

B
2.25×10¹⁸ electrons s⁻¹

C
6.25×10¹⁴ electrons s⁻¹

D
2.25×10¹⁴ electrons s⁻¹

Solution
Question 7
4 / -1

Resistors can be wire bound or carbon resistors. Wire bound resistors are generally made of

A
Aluminium

B
Carbon

C
Copper

D
Manganin

Solution

A Nichrome or manganin is commonly used as the metal wires in wire-wound resistors because they provide high resistance to the electric current and operate at high temperature.
Question 8
4 / -1

The polarized dielectric is equivalent to ________

A
non-zero volume charge density.

B
one charged surface with induced surface charge density.

C
two charged surfaces with induced surface charge densities.

D
zero surface charge density.

Solution

A polarized dielectric is equivalent to two charged surfaces with induced charges (polarization charges).
Question 9
4 / -1

In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will

A
flow in the direction which will be decidedby the value of V

B
be zero

C
flow from B to A

D
flow from A to B

Solution
Question 10
4 / -1

Two equipotential surfaces have a potential of -10V and 90V respectively, what is the difference in potential between these surfaces?

A
90V

B
80V

C
0V

D
100V

Solution

Potential = high potential - low potential

so our high potential is 90V and low potential is 10V,

potential = 90-(-10)=100V