Properties of Bulk Matter

1.

The bulk modulus of a spherical object is B. If it is subjected to uniform pressure p, the fractional decrease in radius is NEET 2017

A.

p/3B

B.

3p/B

C.

B/3p

D.

p/B

Ans. A B C D

Correct answer: Option A

2.

When a weight of 10 kg is suspended from a copper wire of length 3 m and diameter 0.4 mm, its length increases by 2.4 cm. If the diameter of the wire is doubled, then the extension in its length will be: AIPMT 2010

A.

4.8 cm

B.

7.6 cm

C.

0.6 cm

D.

1.2 cm

Ans. A B C D

Correct answer: Option C

3.

A rubber cord catapult has cross-sectional area 25 mm² and initial length of rubber cord is 10 cm. It is stretched to 5 cm and then released to project a missile of mass 5 gm. Taking Y_rubber =5×10⁸ N/m² velocity of projected missile is: CPMT 2002

A.

250 m/s

B.

20 m/s

C.

100 m/s

D.

200 m/s

Ans. A B C D

Correct answer: Option A

4.

The units of Young’s modulus of elasticity are: CPMT 2000

A.

N-m²

B.

N/m²

C.

N/m

D.

N-m

Ans. A B C D

Correct answer: Option B

5.

When a certain weight is suspended from a long uniform wire, its length increases by one cm. If the same weight is suspended from another wire of the same material and length but having a diameter half of the first one then the increase in length will be: CPMT 1984, 90

A.

4 cm

B.

0.5 cm

C.

2 cm

D.

8 cm

Ans. A B C D

Correct answer: Option A

6.

The following four wires are made of same material. Which of these will have the largest extension when the same tension is applied? NEET 2013

A.

Length = 100 cm, diameter = 1mm

B.

Length = 50 cm, diameter = 0 5. mm

C.

Length = 300 cm, diameter = 3 mm

D.

Length = 200 cm, diameter = 2 mm

Ans. A B C D

Correct answer: Option B

7.

Two similar wires under the same load yield elongation of 0.1 mm and 0.05 mm respectively. If the area of cross-section of the first wire is 4 mm², then the area of cross-section of the second wire is: CPMT 2000

A.

8 mm²

B.

12 mm²

C.

6 mm²

D.

10 mm²

Ans. A B C D

Correct answer: Option A

8.

A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is: NEET 2020

A.

20.0 g

B.

2.5 g

C.

5.0 g

D.

10.0 g

Ans. A B C D

Correct answer: Option D

9.

Copper of fixed volume V is drawn into wire of length l. When this wire is subjected to a constant force F, the extension produced in the wire is ∆l. Which of the following graphs is a straight line? AIPMT 2014

A.

∆l versus l

B.

∆l versus 1/l

C.

∆l versus l²

D.

∆l versus 1/l²

Ans. A B C D

Correct answer: Option C

10.

Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by ∆l on applying a force F, how much force is needed to stretch the second wire by the same amount? NEET 2018

A.

9 F

B.

F

C.

6 F

D.

4 F

Ans. A B C D

Correct answer: Option A

Test set 1

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