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NEET Physics Solved Question Paper 2005

Multiple Choice Questions

11.

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

12.

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

13.

Which of the following is an amorphous solid?

glass
diamond
salt
sugar

14.

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

$\frac{∆ V}{V} \propto B$
$\frac{∆ V}{V} \propto \frac{1}{B}$
$\frac{∆ V}{V} \propto B^{2}$
$\frac{∆ V}{V} \propto B^{- 2}$

15.

Which of the following functions represents a simple harmonic oscillation?

sinωt $-$ cosωt
sin²ωt
sinωt + sin2ωt
sinωt $-$ sin2ωt

16.
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

fall at the rate of 1 cm/hour

Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces and acts in the upward direction at the centre of mass of the displaced fluid.

When an object is placed in a fluid, the fluid exerts an upward force we call buoyant force.

Just for the concept of Archimedes' principle

In the above figure, pressure due to the weight of a fluid increase with depth since P = hρg. This pressure and associated upward force on the bottom of the cylinder are greater than the downward force on the top of the cylinder. The difference is the buoyant force F_B ( Horizontal Forces Cancel )

Initial weight of the candle = weight of the liquid displaced

ρ_cV_c g = ρ_L ( volume displaced ) g

⇒ ρ_c $π {(\frac{d}{2})}^{2}$ 2 Lg = ρ_L $π \frac{d^{2}}{2}$ Lg

⇒ $\frac{ρ_{c}}{ρ_{L}} = \frac{1}{2}$ ....(i)

when 2 cm has been burnt, total length = 2L $-$ 2

But ρ_c (2L $-$ 2 ) = ρ_L ( L $-$ x )

ρ_c 2 ( L $-$ 1 ) = 2ρ_c ( L $-$ x ) [ using eqn. (i) ]

∴ x = 1 cm

Outside also it has decreased to 1 cm as the total decrease is 2 cm. The level of the candle comes down at half the rate burning.

17.

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

18.

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

19.

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

20.

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