The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as_________________?

A. Krichoff’s law
B. Stefan’s law
C. Wien’ law
D. Planck’s law

Depending on the radiating properties, a body will be white when_________________?

A. P = 0, x = 0 and a = 1
B. P=l,t = 0anda = 0
C. P = 0, x = 1 and a = 0
D. X = 0, a + p = 1

Depending on the radiating properties, a body will be opaque when _________________?

A. P = 0, x = 0 and a = 1
B. P=l,x = 0anda = 0
C. P = 0, x = 1 and a = 0
D. X – 0, a + p = 1

According to Wien’s law, the wavelength corresponding to maximum energy is proportion to ________________?

A. Absolute temperature (t)
B. I2
C. F
D. T

The unit of work or energy in S.I. units is_______________?

A. newton
B. pascal
C. kilogram meter
D. watt

Forces are called concurrent when their lines of action meet in________________?

A. One point
B. Two points
C. Plane
D. Perpendicular planes

Which is the correct statement about law of polygon of forces ?

A. If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium
B. If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium
C. If a polygon representing forces acting at a point is closed then forces are in equilibrium
D. If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

If a number of forces act simultaneously on a particle, it is possible _____________________?

A. Not a replace them by a single force
B. To replace them by a single force
C. To replace them by a single force through c.g.
D. To replace them by a couple

A force is completely defined when we specify_______________?

A. Magnitude
B. Direction
C. Point of application
D. All of the above

Effect of a force on a body depends upon ________________?

A. Magnitude
B. Direction
C. Position or line of action
D. All of the above