Assertion: Frictional forces are conservative forces. 

Reason:  Potential energy can be associated with frictional forces.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion: : For a system of particles under central force field, the total angular momentum is conserved.

Reason:  The torque acting on such a system is zero.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Which of the following is an amorphous solid?

• glass

• diamond

• salt

• sugar

For a constant hydraulic stress on an object, the fractional change in the object's volume ( ΔV/V ) and its bulk modulus (B) are related as

• $\frac{∆\mathrm{V}}{\mathrm{V}} \propto \mathrm{B}$

• $\frac{∆\mathrm{V}}{\mathrm{V}} \propto \frac{1}{\mathrm{B}}$

• $\frac{∆\mathrm{V}}{\mathrm{V}} \propto {\mathrm{B}}^2$

• $\frac{∆\mathrm{V}}{\mathrm{V}}\propto {\mathrm{B}}^{-2}$

15.

Which of the following functions represents a simple harmonic oscillation?

• sinωt $-$ cosωt

• sin²ωt

• sinωt + sin2ωt

• sinωt $-$ sin2ωt

A candle of diameter d is floating on a liquid in a cylindrical container of diameter D ( D >> d ) as shown in figure. If it is burning at the rate of 2 cm/hour then the top of the candle will

• remain at the same height

• fall at the rate of 1 cm/hour

• fall at the rate of 2 cm/hour

• go up at the rate of 1 cm/hour

A given shaped glass tube having uniform cross section is filled with water and is mounted on a rotatable shaft as shown in figure. If the tube is rotated with a constant angular velocity  ω when

• water levels in both sections A and B go up

• water level in section A goes up and that in B comes down

• water level in section A comes down and that in B it goes up

• water levels remain same in both sections

A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is

Assertion:  Specific gravity of a fluid is a dimensionless quantity

Reason: : It is the ratio of density of fluid to the density of water.

• If both assertion and reason are true and reason is the correct explanation of assertion 

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false

Assertion: Reversible systems are difficult to find in real world. 

Reason : Most processes are dissipative in nature.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false