Physical world and Measurement

The physical quantities not having same dimensions are?

• stress and Young’s modulus

• speed and (µ₀ ℇ₀) ^-1/2

• torque and work

• momentum and Plank’s constant

Which one of the following represents the correct dimensions of the coefficient of viscosity?

• M L^-1 T^-2

• M L² T^-1

• M L^-1 T^-1

• M L^-2 T^-2

A quantity y is related to another quantity x by the equation y = kx^a where k and a are constants. If percentage error in the measurement of x is p, then that in y depends upon:

• k and a

• p and a

• x and a

• p, k and a

Screw gauge shown in the figure has 50 divisions on its circular scale and in one complete rotation of circular scale, the main scale moves by 0.5 mm. The diameter of a sphere is measured using this screw gauge. Two positions of screw gauge are shown in the figure. The diameter of sphere is:

• 1.25 mm

• 1.2 mm

• 2.25 mm

• 2.2 mm

“The most incomprehensible thing about the world is that it is comprehensible.” Who said so:

• Copernicus

• Newton

• Einstein

• Chadwick

If the uncertainty in the volume of a solid sphere is 6%, then the uncertainty in the surface area of the sphere is:

• 2%

• 4%

• 6%

• 12%

Which is the correct unit for measuring astronomical distance?

• mole

• kilometer

• light year

• angstrom

For detecting submarines under water SONAR makes use of:

• laser beams

• radio waves

• ultrasonic wave

• none of these

The most incomprehensible thing about the world is that it is comprehensible.” Who said so:

• Copernicus

• Newton

• Einstein

• Chadwick

The value of Chandra Shekher Limit is

• half the mass of Sun

• 2.4 times the mass of Sun

• 1.4 times the mass of Sun

• none of these