**Mechanical Properties of Fluids Class 12 MCQ**. We covered all the mechanical properties of fluids mcq with answers mht-cet pdf class 12 in this post for free so that you can practice well for the exam.

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## MCQ on Mechanical Properties of Fluids for Class 12 Students

## When a uniform wire of radius r is stretched by a 2kg weight, the increase in its length is 2.00 mm. If the radius of the wire is r/2 and other conditions remain the same, the increase in its length is

1. 8mm

2. 4mm

3. 2mm

4. 1mm

Option 1 – 8mm

## An iron wire of length 4m and diameter 2mm is loaded with a weight of 8 Kg. If Young’s modulus Y for Iron is 2×10¹¹ N/m². Then the increase in the length of the wire is

1. 1mm

2. 2mm

3. 0.5mm

4. 8mm

Option 3 – 0.5mm

## Which law governs the working of spring balance

1. Robert Hooke’s law

2. Newton’s Law

3. Keplor’s Law

4. Young’s Law

Option 1 – Robert Hooke’s law

## The theoretical value of the Poisson ratio lies between

1. -1 and 0

2. -1 and 0.5

3. 0.5 and 1

4. None

Option 2 – -1 and 0.5

## When a spring is loaded, the strain produced is

1. shearing

2. volumetric

3. longitudinal

4. none of these

Option 1 – shearing

## A wire whose cross-sectional area is 2mm² is stretched by a certain load. If a similar wire of triple the area of cross-section is stretched by the same load, the elongation of the second wire would be.

1. 0.033mm

2. 0.03mm

3. 0.3mm

4. 0.66mm

Option 1 – 0.033mm

## A long spring is stretched by 2 cm and its potential energy is V. If the spring is stretched by 10cm. Its potential energy will be

1. 25V

2. V/5

3. 5V

4. V/25

Option 1 – 25V

## The upper end of the wire is 1m long and 4mm radius clamped. The lower end is twisted by an angle of 30°. The angle of the shear is

1. 0.12°

2. 0.0012°

3. 1.2°

4. 120°

Option 1 – 0.12°

## Atomizers work on the principle of

1. Newton’s Second law

2. Archimedes principle

3. Bernoulli’s theorem

4. Stoke’s theorem

Option 3 – Bernoulli’s theorem

## A pipeline carries oil, at a velocity of 2 m/sec through a 20 cm diameter pipe. At another section the diameter is 15 cm. Then the velocity at this section is

1. 2.4 m/sec

2. 3.56 m/sec

3. 4.2 m/sec

4. 8.62 m/sec

Option 2 – 3.56 m/sec

## A water main of 20 cm diameter has a pitot tube fixed into it and the pressure difference indicated by the gauge is 5 cm of water column. Then the rate of flux of water through the main is

1. 0.031 m³/sec

2. 0.0031 m³/sec

3.0.31 m³/sec

4. 3.1 m³/sec

Option 1 – 0.031 m³/sec

## According to the theory of relativity, the simultaneity of two events is

1. Absolute

2. Relative

3. Sometimes absolute and sometimes relative

4. Depending on the importance

Option 2 – Relative

## According to Toricelli’s theorem, the velocity of efflux of a liquid through an orifice is

1. Independent of the height of the liquid above

2. Independent of acceleration due to gravity

3. Independent of the density of liquid

4. Depends on the velocity of liquid

Option 3 – Independent of the density of liquid

## The path of the jet of liquid coming out of an orifice is

1. Parabola

2. Circle

3. Hyperbola

4. Ellipse

Option 1 – Parabola

## The streamlined flow of a liquid through a pipe becomes turbulent flow when its velocity is

1. less than the critical velocity

2. greater than the critical velocity

3. equal to half the critical velocity

4. equal to one-third of critical velocity

Option 2 – greater than the critical velocity

## The velocity of efflux from the orifice of a vessel with a liquid column of height 0.2 m above is (g-10 m/sec²)

1. 0.2 m/sec

2. 2 m/sec

3. 4m/sec

4. 0.4 m/sec

Option 2 – 2 m/sec

1. rate of flow

2. speed of flow

3. density

4. current density

Option 4 – current density

## The ratio of areas of cross sections of a horizontal pipe through which water flows is 2 : 1. The ratio of velocities of water at those points is

1. 1 : 2

2. 2 : 1

3. 4 : 1

4. 1 : 4

Option 1 – 1 : 2

## The equation of continuity is the counterpart of

1. law of conservation of momentum

2. law of conservation of mass

3. law of conservation of energy

4. law of conservation of angular momentum

Option 2 – law of conservation of mass

## The divergence of the velocity of an expanding gas is

1. Negative

2. Zero

3. Positive

4. Does not exist

Option 3 – Positive

## The rate of flow (mass per second) through a pipe of cross-section 0.02 m² with water flowing at a velocity of 5 m/sec is

1. 100 kg/sec

2. 1000 kg/sec

3. 0.1 kg/sec

4. 1 kg/sec

Option 3 – 0.1 kg/sec

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