Home
Current Affairs January 2024

What is the correct answer?

4

First law of thermodynamics deals with

A. Conservation of heat

B. Conservation of momentum

C. Conservation of mass

D. Conservation of energy

Correct Answer :

D. Conservation of energy


Related Questions

What is the correct answer?

4

When a bar is cooled to - 5°C, it will develop

A. No stress

B. Shear stress

C. Tensile stress

D. Compressive stress

What is the correct answer?

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)

What is the correct answer?

4

In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called

A. Creeping

B. Yielding

C. Breaking

D. Plasticity

What is the correct answer?

4

Which of the following has the highest calorific value?

A. Peat

B. Lignite

C. Bituminous coal

D. Anthracite coal

What is the correct answer?

4

Petrol is distilled at

A. 65° to 220°C

B. 220° to 345°C

C. 345° to 470°C

D. 470° to 550°C

What is the correct answer?

4

A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with both ends hinged.

A. l/8

B. l/4

C. l/2

D. l

What is the correct answer?

4

The specific heat at constant volume is

A. The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure

B. The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume

C. The amount of heat required to raise the temperature of 1 kg of water through one degree

D. Any one of the above

What is the correct answer?

4

A molecule consisting of one atom is known as

A. Mono-atomic

B. Di-atomic

C. Tri-atomic

D. Poly-atomic

What is the correct answer?

4

The heating of gas at constant volume is governed by

A. Boyle's law

B. Charles' law

C. Gay-Lussac law

D. Avogadro's law

What is the correct answer?

4

The fuel mostly used in blast furnace for extracting pig iron from iron ores is

A. Hard coke

B. Soft coke

C. Pulverised coal

D. Bituminous coal

What is the correct answer?

4

A hollow shaft of same cross-section area as compared to a solid shaft transmit

A. Same torque

B. Less torque

C. More torque

D. Unpredictable

What is the correct answer?

4

When a gas is heated, change takes place in

A. Pressure

B. Volume

C. Temperature

D. All of these

What is the correct answer?

4

A cylindrical section having no joint is known as

A. Joint less section

B. Homogeneous section

C. Perfect section

D. Seamless section

What is the correct answer?

4

A cantilever beam is one which is

A. Fixed at both ends

B. Fixed at one end and free at the other end

C. Supported at its ends

D. Supported on more than two supports

What is the correct answer?

4

The efficiency of the Carnot cycle may be increased by

A. Increasing the highest temperature

B. Decreasing the highest temperature

C. Increasing the lowest temperature

D. Keeping the lowest temperature constant

What is the correct answer?

4

A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum shear stress will be

A. -100 MPa

B. 250 MPa

C. 300 MPa

D. 400 MPa

What is the correct answer?

4

Brayton cycle consists' of following four processes

A. Two isothermals and two isentropic

B. Two isentropic and two constant volumes

C. Two isentropic, one constant volume and one constant pressure

D. Two isentropic and two constant pressures

What is the correct answer?

4

The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is

A. Same

B. Twice

C. Four times

D. Eight times

What is the correct answer?

4

The efficiency of Diesel cycle increases with

A. Decrease in cut-off

B. Increase in cut-off

C. Constant cut-off

D. None of these

What is the correct answer?

4

Which of the following statement is wrong?

A. The closed cycle gas turbine plants are external combustion plants.

B. In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.

C. The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.

D. In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.

What is the correct answer?

4

In a tensile test, near the elastic limit zone, the

A. Tensile strain increases more quickly

B. Tensile strain decreases more quickly

C. Tensile strain increases in proportion to the stress

D. Tensile strain decreases in proportion to the stress

What is the correct answer?

4

In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is

A. More

B. Less

C. Same

D. More/less depending on composition

What is the correct answer?

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

What is the correct answer?

4

Diesel cycle consists of __________ processes.

A. Two constant volume and two isentropic

B. Two constant pressure and two isentropic

C. Two constant volume and two isothermal

D. One constant pressure, one constant volume and two isentropic

What is the correct answer?

4

The condition for the reversibility of a cycle is

A. The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process

B. All the processes, taking place in the cycle of operation, must be extremely slow

C. The working parts of the engine must be friction free

D. All of the above

What is the correct answer?

4

A column that fails due to direct stress, is called

A. Short column

B. Long column

C. Weak column

D. Medium column

What is the correct answer?

4

An open system is one in which

A. Heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system

B. Mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system

C. Both the heat and work as well as mass of the working substance crosses the boundary of the system

D. Neither the heat and work nor the mass of the working substance crosses the boundary of the system

What is the correct answer?

4

For riveting, the size of hole drilled in plates is __________ shank diameter of rivet.

A. Equal to

B. Less than

C. Greater than

D. None of these

What is the correct answer?

4

The principal constituents of a fuel are

A. Carbon and hydrogen

B. Oxygen and hydrogen

C. Sulphur and oxygen

D. Sulphur and hydrogen

What is the correct answer?

4

The unit of energy is S. I. units is

A. Joule (J)

B. Joule metre (Jm)

C. Watt (W)

D. Joule/metre (J/m)