Units & Measurements
Test 1
Full marks: 40
Time: 10 Minutes
Each right answer contains +4 and Wrong answer -1 marks.
1.
Dimensions of stress are: [NEET 2020]
[ML2 T-2]
2.
The energy required to break one bond in DNA is 10–20 J. This value in eV is nearly: [NEET 2020]
0.6
3.
The angle of 1' (minute of arc) in radian is nearly equal to: [NEET 2020]
2.91 × 10–4 rad
4.
A plano-convex lens of unknown material and unknown focal length is given. With the help of a spherometer we can measure the [NEET 2020]
focal length of the lens.
5.
Time intervals measured by a clock give the following readings: 1.25 s, 1.24 s, 1.27 s, 1.21 s and 1.28 s. What is the percentage relative error of the observations?[NEET 2020]
2%
6.
A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading: 0 mm Circular scale reading: 52 divisions Given that 1 mm on main scale corresponds to 100 divisions on the circular scale. The diameter of the wire from the above data is:[NEET 2021]
0.052 cm
7.
A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is: [NEET 2020]
0.25 mm
8.
Dimension of resistance in an electric circuit in terms of dimensions of mass M, of length L, of time T and of current I, would be:
[ML2 T-2]
9.
The density of material in CGS system of unit is 4 g/cm3. In a system of units in which unit of length is 10 cm and unit of mass is 100 g, the value of density of material will be:
0.4
10.
The ratio of the dimension of Planck’s constant and that of the moment of inertia is the dimension of: [CBSE PMT 2005]
time
Score
