Physics Test 214

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Physics Test 214

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Question 1
4 / -1

In a capillary tube, water rises by 1.2 mm. The height of water that will rise in another capillary tube having half the radius of the first, is

A
1.2 mm

B
2.4 mm

C
0.6 mm

D
0.4 mm

Solution
Question 2
4 / -1

Three forces start acting simultaneously on a particle moving with velocity v → . These forces are represented in magnitude and direction by the three sides of a triangle ABC (as shown). The particle will now move with velocity

A
less than v →

B
greater than v →

C
v → in the direction of largest force BC

D
v → remaining unchanged

Solution

According to triangle law of vector addition, if three vectors are represented by three sides of a triangle taken in same order, then their resultant will be zero. Here, three forces acting on the particle are represented by the three sides of a triangle taken in one order, thus the resultant is zero. So, in presence of zero external force, the particle's velocity remains unchanged.
Question 3
4 / -1

Four bodies P, Q, R and S are projected with equal velocities having angles of projection 15º, 30º, 45º and 60º with the horizontal respectively. The body having shortest range is

A
P

B
Q

C
R

D
S

Solution

When the angle of projection is very far from 45° then range will be minimum.
Question 4
4 / -1

An electric current of 5 A is same as

A
5 J / C

B
5 V / C

C
5 C / sec

D
5 w / sec.:

Solution

Hence 5A of current is same as 5 C/sec
Question 5
4 / -1

The nucleus of ₅₆Ba¹⁴¹ contains ---- neutrons

A
56

B
141

C
85

D
58

Solution

Given ,

=> atomic mass=141

=>atomic number=56

So, neutrons=atomic mass-atomic number

=141-56

=85
Question 6
4 / -1

Assertion : The work done during a round trip is always zero.

Reason : No force is required to move a body in its round trip.

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.

Solution

In a round trip work done is zero only when the force is conservative in nature. Force is always required to move a body in a conservative or non-conservative field
Question 7
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): Study of Fraunhofer lines in the spectrum of sun led to the discovery of hydrogen.

Reason(R):Fraunhofer lines are dark lines in the continuous solar spectrum.

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

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

C
Assertion is false but Reason is true .

D
Both Assertion and Reason are false.

Solution

In 1868 Lockyer observed a line among the Fraunhofer lines which could not be traced in the spectrum of any element on earth. So it was assumed that there was some new element in the sun's chromsphere. It was named helium. In 1895 Ramsay found this gas on earth. Thus, the study of Fraunhofer lines led to the discovery of new elements.
Question 8
4 / -1

A body A of mass M while falling vertically downwards under gravity breaks into two parts, a part B of mass M/3 and body C of mass 2M/3. The centre of mass of the bodies B and C taken together

A
does not shift

B
shifts towards body B

C
shifts towards body C

D
depends upon height of breaking

Solution

No horizontal external force is acting

∴ a_cm = 0

since v_cm = 0

∴ Δx_cm = 0
Question 9
4 / -1

A Carnot engine used first an ideal monoatomic gas and then an ideal diatomic gas. If the source and sink temperature are 411ºC and 69ºC respectively and the engine extracts 1000 J of heat in each cycle, then area enclosed by the P-V diagram is

A
700 J

B
500 J

C
300 J

D
100 J

Solution
Question 10
4 / -1

The Martians use force (F), acceleration (A) and time (T) as their fundamental physical quantities. The dimensions of length on Martians system are

A
FT²

B
F⁻¹T²

C
F⁻¹A²T⁻¹

D
AT²

Solution