Physics Test 199

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Physics Test 199

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Weekly Quiz Competition

Question 1
4 / -1

If a long hollow copper pipe carries a current then magnetic field produced will be

A
inside the pipe only

B
outside the pipe only

C
both inside and outside the pipe

D
neither inside nor outside the pipe

Solution
Question 2
4 / -1

A chain reaction in fission of uranium is possible because

A
large amount of energy is released

B
Two intermediate sized nuclear fragments are formed

C
More than one neutron is given out in each fission

D
Fragments in fission are radioactive

Solution

A nuclear chain reaction occurs when one single nuclear reaction causes an average of one or more subsequent nuclear reactions, thus leading to the possibility of a self-propagating series of these reactions.
Question 3
4 / -1

Two bodies of mass 10 kg and 5 kg moving in concentric orbits of radii R and r such that their periods are the same. Then the ratio between their centripetal acceleration is

A
R/r

B
r/R

C
R²/r²

D
r²/R²

Solution
Question 4
4 / -1

When there is an electric current through a conducting wire along its length then an electric field must exist

A
inside the wire but parallel to it

B
inside the wire but normal to it

C
outside the wire but normal to it

D
outside the wire but parallel to it

Solution

As current is flowing through it , it means charges are flowing along its length therefore heir must be some electric field parallel to the length of the wire. Hence correct option is B.
Question 5
4 / -1

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-

Assertion(A):All radio-active elements are finally converted into lead.

Reason(R):All the elements above lead are unstable

A
Both Assertion and Reason are true and Reason is the correct explanation of assertion.

B
Assertion is false but Reason are true

C
Assertion is true but Reason is false.

D
Both Assertion and Reason are true but Reason is not the correct explanation of assertion.

Solution

For all 4n,4n+2 series elements, on emission of different kind of rays, they form different isotopes of lead and also all element above lead are unstable .

But, 4n+1 series elements (Neptunium series), end in Bi (Bismuth not lead)
Question 6
4 / -1

The moment of inertia of a uniform disc about an axis passing through its centre and perpendicular to its plane is 1kg - m². It is rotating with an angular velocity 100 radians/second. Another identical disc is gently placed on it so that their centres coincide. Now these two discs together continue to rotate about the same axis. Then the loss in kinetic energy in kilo joules is

A
2.5

B
3.0

C
3.5

D
4.0

Solution
Question 7
4 / -1

The internal energy of the gas increases when

A
In adiabatic expansion

B
In adiabatic compression

C
In isothermal expansion

D
In isothermal compression

Solution

When a gas expands adiabatically, it loses internal energy equal to the work done by the gas. In this case the temperature of the gas decreases.

When a gas is compressed adiabatically, it gains internal energy equal to the work done on the gas. In this case the temperature of the gas increases.
Question 8
4 / -1

The dimensional equation for magnetic flux is

A
ML²T^-2I^-1

B
ML²T^-2I^-2

C
ML^-2T^-2I^-1

D
ML^-2T²I^-2

Solution
Question 9
4 / -1

If T is the reverberation time of an auditorium of volume V, then

A
T ∝ V

B
T ∝ V²

C
T ∝ 1/V

D
T ∝ 1/V²

Solution

Generally reverberation time is proportional to linear dimensions of the room. Hence, it will be proportional to the volume of the room.
Question 10
4 / -1

Directions For Questions

Consider the following statements.

(i) All isotopes of an element have the same number of neutrons.

(ii) Only one isotope of an element can be stable and non-radioactive.

(iii) All elements have isotopes.

(iv) All isotopes of Carbon can form chemical compounds with Oxygen-16.

...view full instructions

The correct option regarding an isotope is?

A
(i), (ii) and (iii) only

B
(ii), (iii) and (iv) only

C
(iii) and (iv) only

D
(i) , (iii) and (iv) only

Solution

All elements have isotopes--atoms of the same element can have different number of neutrons.

Carbon form compounds (carbon monoxide and carbon dioxide) with oxygen. This means that all isotopes of carbon can form compounds (carbon monoxide and carbon dioxide) with all isotopes of oxygen, including oxygen-16.

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Re-Attempt Weekly Quiz Competition

Physics Test 199

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Physics Test 199

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SHARING IS CARING

Question 1

inside the pipe only

outside the pipe only

both inside and outside the pipe

neither inside nor outside the pipe

Solution

Question 2

large amount of energy is released

Two intermediate sized nuclear fragments are formed

More than one neutron is given out in each fission

Fragments in fission are radioactive

Solution

Question 3

R/r

r/R

R2/r2

r2/R2

Solution

Question 4

inside the wire but parallel to it

inside the wire but normal to it

outside the wire but normal to it

outside the wire but parallel to it

Solution

Question 5

Both Assertion and Reason are true and Reason is the correct explanation of assertion.

Assertion is false but Reason are true

Assertion is true but Reason is false.

Both Assertion and Reason are true but Reason is not the correct explanation of assertion.

Solution

Question 6

2.5

3.0

3.5

4.0

Solution

Question 7

In adiabatic expansion

In adiabatic compression

In isothermal expansion

In isothermal compression

Solution

Question 8

ML2T-2I-1

ML2T-2I-2

ML-2T-2I-1

ML-2T2I-2

Solution

Question 9

T ∝ V

T ∝ V2

T ∝ 1/V

T ∝ 1/V2

Solution

Question 10

(i), (ii) and (iii) only

(ii), (iii) and (iv) only

(iii) and (iv) only

(i) , (iii) and (iv) only

Solution

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R²/r²

r²/R²

ML²T^-2I^-1

ML²T^-2I^-2

ML^-2T^-2I^-1

ML^-2T²I^-2

T ∝ V²

T ∝ 1/V²