Physics Test 189

Result

Physics Test 189

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Weekly Quiz Competition

Question 1
4 / -1

Helium gas goes through a cycle ABCDA (consisting of two isochoric and isobaric lines) as shown in figure. Efficiency of this cycle is nearly (Assume the gas to be close to ideal gas)

A
15.4%

B
9.1%

C
10.5%

D
12.5%

Solution
Question 2
4 / -1

If the potential energy of a gas molecule is M and N being positive constants. Then the potential energy at equilibrium must be

A
zero

B
M²/4N

C
N²/4M

D
MN²/4

Solution
Question 3
4 / -1

A block connected to a spring oscillates vertically. A damping force Fd, acts on the block by the surrounding medium. Given as b is a positive constant which depends on :

A
viscosity of the medium

B
size of the block

C
shape of the block

D
All of these

Solution

depends on all the three i.e., shape and size of the block and viscosity of the medium.
Question 4
4 / -1

The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is

A
100 cm

B
120 cm

C
140 cm

D
80 cm

Solution
Question 5
4 / -1

A
EL²/ 2

B
zero

C
EL²

D

Solution
Question 6
4 / -1

A parallel plate air capacitor is charged to a potential difference of V volts. After disconnecting the charging battery, the distance between the plates of the capacitor is increased using an insulating handle. As a result, the potential difference between the plates

A
does not change

B
becomes zero

C
increases

D
decreases

Solution

If we increase the distance between the plates its capacity decreases resulting in higher potential as we know Q= CV. Since Qis constant (battery has been disconnected), on decreasing C, V will increase.
Question 7
4 / -1

A car battery has e.m.f. 12 volt and internal resistance ohm. If it draws 60 amp current, the terminal voltage of the battery will be

A
15 volt

B
3 volt

C
5 volt

D
9 volt

Solution
Question 8
4 / -1

When a long wire carrying a steady current is bent into a circular coil of one turn, the magnetic induction at its centre is B. When the same wire carrying the same current is bent to form a circular coil of n turns of a smaller radius, the magnetic induction at the centre will be

A
B/n

B
nB

C
B/n²

D
n²B

Solution
Question 9
4 / -1

A
30 mA

B
60 mA

C
3 A

D
6 A

Solution
Question 10
4 / -1

A magnet is moved towards a coil (i) quickly (ii) slowly, then the induced e.m.f. is

A
larger in case (i)

B
smaller in case (i)

C
equal to both the cases

D
larger or smaller depending upon the radius of the coil

Solution