JEE Main 2019 (Online) 10th January Morning Slot | Units & Measurements Question 142 | Physics

The density of a material in SI units is 128 kg m^–3 . In certain units in which the unit of length is 25 cm and the unit of mass is 50 g, the numerical value of density of the material is -

640

410

JEE Main 2019 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

Expression for time in terms of G(universal gravitional constant), h (Planck constant) and c (speed of light) is proportional to :

$$\sqrt {{{h{c^5}} \over G}} $$

$$\sqrt {{{{c^3}} \over {Gh}}} $$

$$\sqrt {{{Gh} \over {{c^5}}}} $$

$$\sqrt {{{Gh} \over {{c^3}}}} $$

JEE Main 2019 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

The pitch and the number of divisions, on the circular scale, for a given screw gauge are 0.5 mm and 100 respectively. When the screw gauge is fully tightened without any object, the zero of its circular scale lies 3 divisions below the mean line.

The readings of the main scale and the circular scale, for a thin sheet, are 5.5 mm and 48 respectively, the thickness of this sheet is :

5.755 mm

5.950 mm

5.725 mm

5.740 mm

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

A copper wire is stretched to make it 0.5% longer. The percentage change in its electrical resistance if its volume remains unchanged is :

2.0 %

2.5 %

1.0 %

0.5 %