# NEET

Explore popular questions from Properties of Bulk Matter for NEET. This collection covers Properties of Bulk Matter previous year NEET questions hand picked by experienced teachers.

## Biology

Properties of Bulk Matter

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Q 1. The density of water at {tex} 20 ^ { \circ } \mathrm { C } {/tex} is 998{tex} \mathrm { kg } / \mathrm { m } ^ { 3 } {/tex} and at {tex} 40 ^ { \circ } \mathrm { C } \ 992 {/tex} {tex} \mathrm { kg } / \mathrm { m } ^ { 3 } . {/tex} The coefficient of volume expansion of water is

A

{tex} 10 ^ { - 4 / {^ \circ }} \mathrm { C } {/tex}

{tex} 3 \times 10 ^ { - 4 / ^ { \circ } }\mathrm { C } {/tex}

C

{tex} 2 \times 10 ^ { - 4 } / ^ { \circ } \mathrm { C } {/tex}

D

{tex} 6 \times 10 ^ { - 4 } / ^ { \circ } \mathrm { C } {/tex}

##### Explanation

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Q 2. If a bar is made of copper whose coefficient of linear expansion is one and a half times that of iron, the ratio of force developed in the copper bar to the iron bar of identical lengths and cross-sections, when heated through the same temperature range (Young's modulus of copper may be taken to be equal to that of iron) is

{tex}3 / 2 {/tex}

B

{tex}2 / 3 {/tex}

C

{tex}4/ 9 {/tex}

D

{tex} 4/ 9 {/tex}

##### Explanation

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Q 3. A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is: {tex} \left. \text { [Latent heat of ice is } 3.4 \times 10 ^ { 5 } \mathrm { J } / \mathrm { kg } = 10 \mathrm { N } / \mathrm { kg } \right] {/tex}

A

34{tex} \mathrm { km } {/tex}

B

544{tex} \mathrm { km } {/tex}

136{tex} \mathrm { km } {/tex}

D

68{tex} \mathrm { km } {/tex}

##### Explanation

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Q 4. A body of mass {tex} \mathrm { 5kg } {/tex} falls from a height of {tex}20{/tex} metres on the ground and it rebounds to a height of {tex} 0.2 \mathrm { m } . {/tex} If the loss in potential energy is used up by the body, then what will be the temperature rise?
(specific heat of material = {tex}\mathrm{0.09\,cal\,gm^{-1} {^\circ} C ^{-1}}{/tex})

A

{tex} 0 ^ { \circ } \mathrm { C } {/tex}

B

{tex} 4 ^ { \circ } \mathrm { C } {/tex}

C

{tex} 8 ^ { \circ } \mathrm { C } {/tex}

None of these

##### Explanation

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Q 5. Two straight metallic strips each of thickness {tex}t{/tex} and length {tex} \ell {/tex} are rivetted together. Their coefficients of linear expansions are {tex} \alpha _ { 1 } {/tex} and {tex} \alpha _ { 2 } {/tex} . If they are heated through temperature {tex} \Delta \mathrm { T } {/tex} , the bimetallic strip will bend to form an arc of radius

A

{tex} \mathrm { \frac { t } {\left( \alpha _ { 1 } + \alpha _ { 2 } \right) \Delta T }} {/tex}

{tex} \mathrm { \frac { t } {\left( \alpha _ { 2 } - \alpha _ { 1 } \right) \Delta T }} {/tex}

C

{tex} \mathrm { { t } {\left( \alpha _ { 1 } - \alpha _ { 2 } \right) \Delta T }} {/tex}

D

{tex} \mathrm { { t } {\left( \alpha _ { 2 } - \alpha _ { 1 } \right) \Delta T }} {/tex}

##### Explanation

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Q 6. The figure shows a system of two concentric spheres of radii {tex} r _ { 1 } {/tex} and {tex} r _ { 2 } {/tex} are kept at temperatures {tex} T _ { 1 } {/tex} and {tex} T _ { 2 } {/tex} ,respectively. The radial rate of flow heat in a substance between the two concentric spheres is proportional to

A

{tex} \ell n \left( \frac { r _ { 2 } } { n } \right) {/tex}

B

{tex} \frac { \left( r _ { 2 } - r _ { 1 } \right) } { \left( r _ { 1 } r _ { 2 } \right) } {/tex}

C

{tex} \left( r _ { 2 } - r _ { 1 } \right) {/tex}

{tex} \frac { r _ { 1 } r _ { 2 } } { \left( r _ { 2 } - r _ { 1 } \right) } {/tex}

##### Explanation

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Q 7. A block of steel heated to {tex} 100 ^ { \circ } \mathrm { C } {/tex} is left in a room to cool. Which of the curves shown in fig., represents the correct behaviour?

{tex} \mathrm { A } {/tex}

B

{tex} B {/tex}

C

{tex} C {/tex}

D

None of these

##### Explanation

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Q 8. Which of the following will expand the most for same rise in temperature?

Aluminium

B

Glass

C

Wood

D

All will expand same

##### Explanation

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Q 9. The plots of intensity versus wavelength for three black bodies at temperatures {tex} T _ { 1 } , T _ { 2 } {/tex} and {tex} T _ { 3 } {/tex} respectively are as shown. Their temperature are such that

A

{tex} T _ { 1 } > T _ { 2 } > T _ { 3 } {/tex}

{tex} T _ { 1 } > T _ { 3 } > T _ { 2 } {/tex}

C

{tex} T _ { 2 } > T _ { 3 } > T _ { 1 } {/tex}

D

{tex} T _ { 3 } > T _ { 2 } > T _ { 1 } {/tex}

##### Explanation

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Q 10. When the temperature of a rod increases from {tex}\mathrm t{/tex} to {tex} \mathrm { t } + \Delta \mathrm { t } {/tex} , its moment of inertia increases from {tex}\mathrm I{/tex} to {tex} \mathrm { I } + \Delta \mathrm { I } {/tex} . If {tex} \alpha {/tex} be the coefficient of linear expansion of the rod, then the value of {tex} \frac { \Delta \mathrm { I } } { \mathrm { I } } {/tex} is

2{tex} \alpha \triangle t {/tex}

B

{tex} \alpha \Delta \mathrm { T } {/tex}

C

{tex} \frac { \alpha \Delta t } { 2 } {/tex}

D

{tex} \frac { \Delta \mathrm { t } } { \alpha } {/tex}

##### Explanation

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Q 11. Two rods, one of aluminum and the other made of steel, having initial length {tex} \ell _ { 1 } {/tex} and {tex} \ell _ { 2 } {/tex} are connected together to form a single rod of length {tex} \ell _ { 1 } + \ell _ { 2 } . {/tex} The coefficients of linear expansion for aluminum and steel are {tex} \alpha _ { a } {/tex} and {tex} \alpha _ { s } {/tex} and respectively. If the length of each rod increases by the same amount when their temperature are raised by {tex} t ^ { 0 } \mathrm { C } , {/tex} then find the ratio {tex} \ell _ { 1 } / \left( \ell _ { 1 } + \ell _ { 2 } \right) {/tex}

A

{tex} \alpha_s / \alpha_a {/tex}

B

{tex} \alpha _ { a } / \alpha _ { s } {/tex}

{tex} \alpha_s / \left( \alpha _ { a } + \alpha _ { s } \right) {/tex}

D

{tex} \alpha _ { a } / \left( \alpha _ { a } + \alpha _ { s } \right) {/tex}

##### Explanation

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Q 12. A polished metal plate with a rough black spot on it is heated to about 1400{tex} \mathrm { K } {/tex} and quickly taken into a dark room. Which one of the following statements will be true?

The spot will appear brighter than the plate

B

The spot will appear darker than the plate

C

The spot and piate will appear equally bright

D

The spot and the plate will not be visible in the dark room

##### Explanation

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Q 13. On observing light from three different stars {tex} \mathrm { P } , \mathrm { Q } {/tex} and {tex} \mathrm { R } {/tex} , it was found that intensity of violet colour is maximum in the spectrum of {tex} \mathrm { P } {/tex} , the intensity of green colour is maximum in the spectrum of {tex} \mathrm { R } {/tex} and the intensity of red colour is maximum in the spectrum of {tex} \mathrm { Q } {/tex}. If {tex} \mathrm T_{ \mathrm P},\, \mathrm T _ { \mathrm Q } {/tex} and {tex} \mathrm T _ { \mathrm R } {/tex} are the respective absolute temperature of {tex} \mathrm{P , Q} {/tex} and {tex} \mathrm R , {/tex} then it can be concluded from the above observations that

{tex} \mathrm { T } _ { \mathrm { p } } > \mathrm { T } _ { \mathrm { R } } > \mathrm { T } _ { \mathrm { Q } } {/tex}

B

{tex} \mathrm { T } _ { \mathrm { p } } < \mathrm { T } _ { \mathrm { R } } < \mathrm { T } _ { \mathrm { Q } } {/tex}

C

{tex} \mathrm { T } _ { \mathrm { p } } < \mathrm { T } _ { \mathrm { Q } } < \mathrm { T } _ { \mathrm { R } } {/tex}

D

{tex} \mathrm { T } _ { \mathrm { P } } > \mathrm { T } _ { \mathrm { Q } } ^ { } > \mathrm { T } _ { \mathrm { R } } ^ { } {/tex}

##### Explanation

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Q 14. A partition wall has two layers of different materials {tex} \mathrm A {/tex} and {tex} \mathrm B {/tex} in contact with each other. They have the same thickness but the thermal conductivity of layer {tex} \mathrm A {/tex} is twice that of layer {tex} \mathrm B {/tex}. At steady state the temperature difference across the layer {tex} \mathrm B {/tex} is {tex} \mathrm { 50K } {/tex} , then the corresponding difference across the layer {tex} \mathrm { A } {/tex} is

A

50{tex} \mathrm { K } {/tex}

B

12.5{tex} \mathrm { K } {/tex}

25{tex} \mathrm { K } {/tex}

D

60{tex} \mathrm { K } {/tex}

##### Explanation

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Q 15. Which of the following statements is/are false about mode of heat transfer?

A

In radiation, heat is transfered from one medium to another without affecting the intervening medium

Radiation and convection are possible in vaccum while conduction requires material medium

C

Conduction is possible in solids while convection occurs in liquids and gases

D

All are correct

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Q 16. In a vertical U-tube containing a liquid, the two arms are maintained at different temperatures {tex} t _ { 1 } {/tex} and {tex} t _ { 2 } {/tex} . The liquid columns in the two arms have heights {tex} l _ { 1 } {/tex} and {tex} l _ { 2 } {/tex} respectively. The coefficient of volume expansion of the liquid is equal to

{tex} \frac { l _ { 1 } - l _ { 2 } } { l _ { 2 } t _ { 1 } - l _ { 1 } t _ { 2 } } {/tex}

B

{tex} \frac { l _ { 1 } - l _ { 2 } } { l _ { 1 } t _ { 1 } - l _ { 2 } t _ { 2 } } {/tex}

C

{tex} \frac { l _ { 1 } + l _ { 2 } } { l _ { 2 } t _ { 1 } + l _ { 1 } t _ { 2 } } {/tex}

D

{tex} \frac { l _ { 1 } + l _ { 2 } } { l _ { 1 } t _ { 1 } + l _ { 2 } t _ { 2 } } {/tex}

##### Explanation

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Q 17. The top of an insulated cylinder container is covered by a disc having emissivity {tex}0.6{/tex} and conductivity {tex}\mathrm{ 0.167 WK^{-1}\,m^{-1}}{/tex} and thickness {tex}1 \mathrm {cm}{/tex}. The temperature is maintained by circulating oil as shown in figure. Find the radiation loss to the surrounding in {tex} \mathrm { Jm } ^ { - 2 } \mathrm { s } ^ { - 1 } {/tex} if temperature of the upper surface of the disc is {tex} 27 ^ { \circ } \mathrm { C } {/tex} and temperature of the surrounding is {tex} 27 ^ { \circ } \mathrm { C } {/tex} .

595 {tex} \mathrm { Jm } ^ { - 2 } \mathrm { s } ^ { - 1 } {/tex}

B

545 {tex} \mathrm { Jm } ^ { - 2 } \mathrm { s } ^ { - 1 } {/tex}

C

495{tex} \mathrm { Jm } ^ { - 2 } \mathrm { s } ^ { - 1 } {/tex}

D

None of these

##### Explanation

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Q 18. Two rods of same length and transfer a given amount of heat 12 second, when they are joined as shown in figure
(i). But when they are joined as shown in figure
(ii), then they will transfer same heat in same conditions in

A

24{tex} \mathrm { s } {/tex}

B

13{tex} \mathrm { s } {/tex}

C

15{tex} \mathrm { s } {/tex}

48{tex} \mathrm { s } {/tex}

##### Explanation

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Q 19. The radiation energy density per unit wavelength at a temperature {tex}\mathrm T{/tex} has a maximum at a wavelength {tex} \lambda _ { 0 } . {/tex} At temperature {tex} 2 \mathrm { T } , {/tex} it will have a maximum wavelength

A

4{tex} \lambda _ { 0 } {/tex}

B

2{tex} \lambda _ { 0 } {/tex}

{tex} \frac { \lambda _ { 0 } } { 2 } {/tex}

D

{tex} \frac { \lambda _ { 0 } } { 4 } {/tex}

##### Explanation

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Q 20. Assuming the Sun to be a spherical body of radius {tex} R {/tex} at a temperature of {tex} T K {/tex} , evaluate the total radiant powerd incident of Earth at a distance {tex} r {/tex} from the Sun

A

4{tex} \pi r _ { 0 } ^ { 2 } R ^ { 2 } \sigma \frac { T ^ { 4 } } { r ^ { 2 } } {/tex}

{tex} \pi r _ { 0 } ^ { 2 } R ^ { 2 } \sigma \frac { T ^ { 4 } } { r ^ { 2 } } {/tex}

C

{tex} r _ { 0 } ^ { 2 } R ^ { 2 } \sigma \frac { T ^ { 4 } } { 4 \pi r ^ { 2 } } {/tex}

D

{tex} R ^ { 2 } \sigma \frac { T ^ { 4 } } { r ^ { 2 } } {/tex}

##### Explanation

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Q 21. A metal ball immersed in alcohol weighs {tex} \mathrm { W } _ { 1 } {/tex} at {tex} 0 ^ { \circ } \mathrm { C } {/tex} and {tex} \mathrm { W } _ { 2 } {/tex} at {tex} 50 ^ { \circ } \mathrm { C } . {/tex} The coefficient of cubical expansion of the metal is less than that of alcohol. Assuming that the density of the metal is large compared to that of alcohol, it can be shown that

A

{tex} \mathrm { W } _ { 1 } > \mathrm { W } _ { 2 } {/tex}

B

{tex} \mathrm { W } _ { 1 } = \mathrm { W } _ { 2 } {/tex}

{tex} \mathrm { W } _ { 1 } < \mathrm { W } _ { 2 } {/tex}

D

{tex} \mathrm { W } _ { 1 } = \left( \mathrm { W } _ { 2 } / 2 \right) {/tex}

##### Explanation

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Q 22. One end of a thermally insulated rod is kept at a temperature {tex} T _ { 1 } {/tex} and the other at {tex} T _ { 2 } {/tex} . The rod is composed of two sections of length {tex} l _ { 1 } {/tex} and {tex} l _ { 2 } {/tex} and thermal conductivities {tex} K _ { 1 } {/tex} and {tex} K _ { 2 } {/tex} respectively. The temperature at the interface of the two sections is

A

{tex} \frac { \left( K _ { 1 } l _ { 1 } T _ { 1 } + K _ { 2 } l _ { 2 } T _ { 2 } \right) } { \left( K _ { 1 } l _ { 1 } + K _ { 2 } l _ { 2 } \right) } {/tex}

B

{tex} \frac { \left( K _ { 2 } l _ { 2 } T _ { 1 } + K _ { 1 } l _ { 1 } T _ { 2 } \right) } { \left( K _ { 1 } l _ { 1 } + K _ { 2 } l _ { 2 } \right) } {/tex}

C

{tex} \frac { \left( K _ { 2 } l _ { 1 } T _ { 1 } + K _ { 1 } l _ { 2 } T _ { 2 } \right) } { \left( K _ { 2 } l _ { 1 } + K _ { 1 } l _ { 2 } \right) } {/tex}

{tex} \frac { \left( K _ { 1 } l _ { 2 } T _ { 1 } + K _ { 2 } l _ { 1 } T _ { 2 } \right) } { \left( K _ { 1 } l _ { 2 } + K _ { 2 } l _ { 1 } \right) } {/tex}

##### Explanation

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Q 23. Two spheres of different materials one with double the radius and one-fourth wall thickness of the other are filled with ice. If the time taken for complete melting of ice in the larger sphere is 25 minute and for smaller one is 16 minute, the ratio of thermal conductivities of the materials of larger spheres to that of smaller sphere is

A

{tex} 4 : 5 {/tex}

B

{tex} 5 : 4 {/tex}

C

{tex} 25 : 8 {/tex}

{tex} 8 : 25 {/tex}

##### Explanation

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Q 24. A black body has maximum wavelength {tex} \lambda _ { m } {/tex} at temperature 2000{tex} \mathrm { K } {/tex} . Its corresponding wavelength at temperature 3000 {tex} \mathrm { K } {/tex} will be

A

{tex} \frac { 3 } { 2 } \lambda _ { m } {/tex}

{tex} \frac { 2 } { 3 } \lambda _ { m } {/tex}

C

{tex} \frac { 4 } { 9 } \lambda _ { m } {/tex}

D

{tex} \frac { 9 } { 4 } \lambda _ { m } {/tex}

##### Explanation

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Q 25. A solid material is supplied with heat at constant rate and the temperature of the material changes as shown. From the graph, the FALSE conclusion drawn is

A

{tex} \mathrm { AB } {/tex} and {tex} \mathrm { CD } {/tex} of the graph represent phase changes

B

AB represents the change of state from solid to liquid

latent heat of fusion is twice the latent heat of vaporization

D

CD represents change of state from liquid to vapour