Physics Test

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Physics Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

A hoop of radius r and mass m rotating with an angular velocity ω0 is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip?

A

rω0/2

B

rω0/4

C

rω0

D

rω0/3
Question 2
1 / -0

A uniform cylinder of length L and mass M having cross-sectional area A is suspended, with its length vertical, from a fixed point by a massless spring, such that it is half submerged in a liquid of density σ at equilibrium position. The extension x0 of the spring when it is in equilibrium is:

A

Option 3

B

Option 2

C

Option 4

D

Option 1
Question 3
1 / -0

This question has statement 1 and statement 2. Of the four choices given after the statements, choose the one that best describes the two statementsStatement 1 : Davisson – germer experiment established the wave nature of electrons.Statement 2 : If electrons have wave nature, they can interfere and show diffraction.

A

Statement 1 is false, Statement 2 is true

B

Statement 1 is true, Statement 2 is true, Statement 2 is not the correct explanation for statement 1.

C

Statement 1 is true, Statement 2 is false

D

Statement 1 is true, Statement 2 is the correct explanation for statement 1
Question 4
1 / -0

In an LCR circuit as shown below both switches are open initially. Now switch S1 is closed, S2 kept open. (q is charge on the capacitor and τ = RC is capacitive time constant). Which of the following statement is correct?

A

At t = 2τ, q = CV(1 − e^−2 )

B

At t = τ, q = CV/2

C

At t = τ/2, q = CV(1- e^-1 )

D

Work done by the battery is half of the energy dissipated in the resistor.
Question 5
1 / -0

The figure shows an experimental plot for discharging of a capacitor in an R-C circuit. The time constant τ of this circuit lies between:

A

100 sec and 150 sec

B

0 and 50 sec

C

50 sec and 100 sec

D

150 sec and 200 sec
Question 6
1 / -0

What is the minimum energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbit at an altitude of 2R?

A

GmM/3R

B

GmM/2R

C

5GmM/6R

D

2GmM/3R
Question 7
1 / -0

Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be

A

5

B

6

C

3

D

2
Question 8
1 / -0

The graph between angle of deviation (δ) and angle of incidence (i) for a triangular prism is represented by:

A

Option 3

B

Option 2

C

Option 4

D

Option 1
Question 9
1 / -0

This question has statement I and statement II. Of the four choices given after the statements, choose the one that best describes the two statements. Statement- I: Higher the range, greater is the resistance of ammeter.Statement- II: To increase the range of ammeter, additional shunt needs to be used across it.

A

Statement – I is true, statement – II is false.

B

Statement – I is true, Statement – II is true, Statement – II is the correct explanation of statement- I .

C

Statement – I is false, Statement – II is true

D

Statement – I is true, Statement – II is true, Statement – II is not the correct explanation of Statement–I.
Question 10
1 / -0

A wooden wheel of radius R is made of two semicircular parts (see figure); The two parts are held together by a ring made of a metal strip of cross sectional area S and length L. L is slightly less than 2πR. To fit the ring on the wheel, it is heated so that its temperature rises by ∆T and it just steps over the wheel. As it cools down to surrounding temperature, it presses the semicircular parts together. If the coefficient of linear expansion of the metal is α, and its Youngs'modulus is Y, the force that one part of the wheel applies on the other part is :

A

πSYα ∆T

B

2SYα ∆T

C

SYα∆T

D

2πSYα∆T