Physics Test

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Physics Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

A long metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature θ along the length x of the bar from its hot end is best described by which of the following figure.

A

Option 1

B

Option 2

C

Option 3

D

Option 4
Question 2
1 / -0

Two wires are made of the same material and have the same volume. However wire 1 has cross-sectional area A and wire-2 has cross-sectional area 3A. If the length of wire 1 increases by ∆x on applying force F, how much force is needed to stretch wire 2 by the same amount?

A

9F

B

4F

C

F

D

6F
Question 3
1 / -0

Directions: Two moles of helium gas are taken over the cycle ABCDA, as shown in the P – T diagram. Question : The work done on the gas in taking it from D to A is

A

+ 690 R

B

– 690 R

C

+ 414 R

D

– 414 R
Question 4
1 / -0

While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18 cm during winter. Repeating the same experiment during summer, she measures the column length to be x cm for the second resonance. Then

A

54 > x > 36

B

36 > x > 18

C

x >54

D

18 > x
Question 5
1 / -0

The speed of sound in oxygen (O2) at a certain temperature is 460 ms^−1. The speed of sound in helium (He) at the same temperature will be (assumed both gases to be ideal)

A

330 ms^−1

B

650 ms^−1

C

460 ms^−1

D

None of these
Question 6
1 / -0

This question contains Statement -1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements.Statement – I: For a mass M kept at the centre of a cube of side ‘a’, the flux of gravitational field passing through its sides is 4π GM. andStatement – II If the direction of a field due to a point source is radial and its dependence on the distance ‘r’ for the source is given as 1/r^2, its flux through a closed surface depends only on the strength of the source enclosed by the surface and not on the size or shape of the surface

A

Statement – 1is true, Statement – 2 is true; Statement -2 is correct explanation for Statement-1.

B

Statement – 1is false, Statement – 2 is true.

C

Statement – 1is true, Statement – 2 is true; Statement -2 is not a correct explanation for Statement-1.

D

Statement – 1 is true, Statement – 2 is False.
Question 7
1 / -0

A wave travelling along the x-axis is described by the equation y(x, t) = 0.005 cos (αx −βt). If the wavelength and the time period of the wave are 0.08 m and 2.0 s, respectively, then α and β in appropriate units are

A

α = 0.08/π , 2.0/π

B

α = 25.00 π, β = π

C

α = 12.50 π, β =π/2.0

D

α = 0.04/π ,β = 1.0/π
Question 8
1 / -0

In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position, the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance v, from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of 45 deg with the x-axis meets the experimental curve at P. The coordinates of P will be

A

(2f, 2f)

B

(f, f)

C

(f/2 , f/2)

D

(4f, 4f)
Question 9
1 / -0

An inductor of inductance L = 400 mH and resistors of resistances R1 = 2Ω and R2 = 2Ω are connected to a battery of emf 12V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t = 0. The potential drop across L as a function of time is

A

12e^-5t V

B

12/t e^-3t V

C

6e^-5t V

D

6(1- e^-t/0.2 ) V
Question 10
1 / -0

In the circuit below, A and B represent two inputs and C represents the output. The circuit represents

A

OR gate

B

NAND gate

C

AND gate

D

NOR gate