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4

Those substances which have so far not been resolved by any means into other substances of simpler form are called

A. Elements

B. Compounds

C. Atoms

D. Molecules

Correct Answer :

A. Elements


Related Questions

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4

The efficiency of the dual combustion cycle for the same compression ratio is __________ Diesel cycle.

A. Greater than

B. Less than

C. Equal to

D. None of these

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4

When a gas is heated, change takes place in

A. Pressure

B. Volume

C. Temperature

D. All of these

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4

Which of the following is a proper sequence?

A. Proportional limit, elastic limit, yielding, failure

B. Elastic limit, proportional limit, yielding, failure

C. Yielding, proportional limit, elastic limit, failure

D. None of the above

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4

The compression ratio for petrol engines is

A. 3 to 6

B. 5 to 8

C. 15 to 20

D. 20 to 30

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4

The value of 1 mm of Hg is equal to

A. 1.333 N/m2

B. 13.33 N/m2

C. 133.3 N/m2

D. 1333 N/m2

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4

According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) _________ with the change in pressure and temperature of the gas.

A. Change

B. Do not change

C. Both (A) and (B)

D. None of these

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4

The stress developed in a material at breaking point in extension is called

A. Breaking stress

B. Fracture stress

C. Yield point stress

D. Ultimate tensile stress

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4

The ratio of the largest load in a test to the original cross-sectional area of the test piece is called

A. Elastic limit

B. Yield stress

C. Ultimate stress

D. Breaking stress

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4

In case of an under-reinforced beam, the depth of actual neutral axis is __________ that of the critical neutral axis.

A. Same as

B. Less than

C. Greater than

D. None of these

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4

In a uniform bar, supported at one end in position, the maximum stress under self weight of bar shall occur at the

A. Middle of bar

B. Supported end

C. Bottom end

D. None of these

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4

When shear force at a point is zero, then bending moment is _________ at that point.

A. Zero

B. Minimum

C. Maximum

D. Infinity

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4

When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is

A. Coke

B. Wood charcoal

C. Bituminous coal

D. Briquetted coal

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4

When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the stiffness of the spring is given by

A. Cd⁴/D3n

B. Cd⁴/2D3n

C. Cd⁴/4D3n

D. Cd⁴/8D3n

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4

Workdone during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)

A. (p1 v1 - p2 v2)/(γ - 1)

B. [m R (T1 - T2)] /(γ - 1)

C. [m R T1/(γ - 1)][1 - (p2 v2 /p1 v1)]

D. All of these

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4

Which of the following is an irreversible cycle?

A. Carnot

B. Stirling

C. Ericsson

D. None of the above

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4

The maximum bending moment for the beam shown in the below figure, is

A. wl²/3√3

B. wl²/6√3

C. wl²/9√3

D. wl²/12√3

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4

The root mean square velocity of the gas molecules is given by (where k = Boltzmann's constant, T = Absolute temperature, and m = Mass of one molecule of a gas)

A. √(KT/m)

B. √(2KT/m)

C. √(3KT/m)

D. √(5KT/m)

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4

When a thin cylindrical shell is subjected to an internal pressure, the volumetric strain is (where ε₁ = Hoop strain, and ε₂ = Longitudinal strain)

A. 2ε₁ - ε₂

B. 2ε₁ + ε₂

C. 2ε₂ - ε₁

D. 2ε₂ + ε₁

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4

A composite bar made up of steel and copper bars of equal lengths are heated through 100°C. The stresses developed shall be

A. Tensile in both the material

B. Tensile in steel and compressive in copper

C. Compressive in steel and tensile in copper

D. Compressive in both the materials

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4

The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by

A. Boyle's law

B. Charles' law

C. Gay-Lussac law

D. All of these

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4

If the radius of wire stretched by a load is doubled, then its Youngs modulus will be

A. Doubled

B. Halved

C. Becomes four times

D. None of the above

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4

Stirling and Ericsson cycles are

A. Reversible cycles

B. Irreversible cycles

C. Semi-reversible cycles

D. Quasi-static cycles

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4

One kg of carbon monoxide requires _______kg of oxygen to produce 11/7 kg of carbon dioxide gas.

A. 11/7

B. 9/7

C. 4/7

D. All of the above

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4

The standard value of atmospheric pressure taken at sea level is

A. 1.013 bar

B. 760 mm of Hg

C. 1013 × 102 N/m2

D. All of these

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4

The change of entropy, when heat is absorbed by the gas, is

A. Positive

B. Negative

C. Positive or negative

D. None of these

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4

The value of cp/cv for air is

A. 1

B. 1.4

C. 1.45

D. 2.3

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4

Otto cycle is also known as

A. Constant pressure cycle

B. Constant volume cycle

C. Constant temperature cycle

D. Constant temperature and pressure cycle

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4

Slenderness of a column is zero when

A. Ends are firmly fixed

B. Column is supported on all sides throughout the length

C. Length is equal to radius of gyration

D. Length is twice the radius of gyration

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4

If Th is the torque resisting capacity of a hollow shaft and Ts is that of a solid shaft, of the same material, length and weight. Then,

A. Th > Ts

B. Th < Ts

C. Th = Ts

D. None of these

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4

According to Avogadro's law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.

A. Equal to

B. Directly proportional to

C. Inversely proportional to

D. None of these