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C.O.P is reciprocal of efficiency of heat engine.
So 1/0.2 = 5 = C.O.P of heat engine.

Now C.O.P of refrigerator = c.o.p of heat engine-1 = 5-1 = 4.

Strength of the magnetic field can be increased by:
=> increasing the current in the coil
=> increasing the number of coils in the solenoid
=>using a soft iron core within the solenoid.

Paramagnetic properties are due to the presence of some unpaired electrons, and from the realignment of the electron paths caused by the external magnetic field.
These are metals that are weakly attracted to magnets. They include aluminum, gold, copper, magnesium, molybdenum, lithium, and tantalum

It is basically a brick or paver with a rounded off edge.
Bullnose brick is a style of brick that has one, some or all of its corners rounded off.
These bricks can be used to create soft and attractive curved edges to steps, sills, or in capping walls.

Tests on bricks are conducted at construction site as well as in laboratory.
A good brick should resist scratches against sharp things.
So, for this test a sharp tool or finger nail is used to make scratch on brick.
If there is no scratch impression on brick then it is said to be hard brick.
Hence Hardness test is the correct answer.

Plain round rebar has a range of applications from reinforced concrete piers, bored piles and footings to walls, beams, columns, slabs and precast products. Round rebar from InfraBuild Construction Solutions is a Class N (normal ductility) bar and is available in 250 MPa for diameters 10?36mm.

Circlips is kind of a retaining ring consisting of a semi-flexible metal ring with open ends which can be snapped into place.
Circlip retainers are important to help maintain the proper seating and function of the wheel bearing. They are commonly used in motors, pistons, turbines.
The standard material for all circlips with the exception of some smaller external types which are made from beryllium copper which is a carbon spring steel.

A thermocouple is an electrical device consisting of two dissimilar electrical conductors forming electrical junctions at differing temperatures. A thermocouple produces a temperature-dependent voltage as a result of the thermoelectric effect, and this voltage can be interpreted to measure temperature. Thermocouples are a widely used type of temperature sensor.

The extension code commonly associated with Excel files is “.xls”.
This extension represents the default file format used by Microsoft Excel for saving workbooks in versions 2007 and onwards.
Earlier versions of Excel used different file extensions such as “.xls” for Excel 97-2003 workbooks and “.xlsm” for workbooks containing macros.
However, “.xlsx” is the most commonly used extension for Excel files in recent versions.

In power supplies and many other circuits, Zener diode finds its application as a constant voltage provider or a voltage reference. The only conditions are that the input voltage should be greater than zener voltage and the series resistor should have a minimum value such that the maximum current flows through the device. so voltage given by an external circuit

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