A student measured the diameter of a small steel ball using a screw gauge of least count \(0.001\) cm. The main scale reading is \(5\) mm and zero of circular scale division coincides with \(25\) divisions above the reference level. If the screw gauge has a zero error of \(-0.004\) cm, the correct diameter of the ball is:
1. \(0.521\) cm
2. \(0.525\) cm
3. \(0.053\) cm
4. \(0.529\) cm

Subtopic:  Measurement & Measuring Devices |
 63%
From NCERT
NEET - 2018
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A physical quantity of the dimensions of length that can be formed out of c, G and e24πεois [c is the velocity of light, G is the universal constant of gravitation and e is charge]:

1. c2Ge24πε012

2. 1c2e24Gπε012

3. 1cGe24πε0

4. 1c2Ge24πε012

Subtopic:  Dimensions |
 53%
From NCERT
NEET - 2017
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Planck's constant (\(h\)), speed of light in the vacuum (\(c\)), and Newton's gravitational constant (\(G\)) are three fundamental constants. Which of the following combinations of these has the dimension of length?
1. \(\frac{\sqrt{hG}}{c^{3/2}}\)
2. \(\frac{\sqrt{hG}}{c^{5/2}}\)
3. \(\frac{\sqrt{hG}}{G}\)
4. \(\frac{\sqrt{Gc}}{h^{3/2}}\)

Subtopic:  Dimensions |
 71%
From NCERT
NEET - 2016
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