The value of 60$°$ in radian is 

(1) $\frac{\pi }{2}$

(2) $\frac{\pi }{3}$

(3) $\frac{\pi }{4}$

(4) $\frac{\pi }{5}$

The total plane angle subtended by a circle at its centre is 

(1) $\pi rad$

(2) $2\pi rad$

(3) $\frac{2\pi }{3}rad$

(4) $\frac{\pi }{2}rad$

One unified atomic mass represents a mass of magnitude

(1) ${10}^{-30} Kg$

(2) $1.66 \times {10}^{27} Kg$

(3) $1.66\times {10}^{-27}$

(4)  $Kg {10}^{33} Kg$

A far off planet is estimated to be at a distance D from the earth. lf its diametrically opposite extremes subtend an angle at $\theta$ an observation situated on the earth, the approximate diameter of the planet is 

(1) $\frac{\theta }{D}$

(2) $\frac{D}{\mathit{\theta }}$

(3) $D\theta$

(4) $\frac{1}{D\theta }$

lf the average life of a person is taken as 100 s. the age of the universe on this scale is of the order 

(1) ${10}^{10} s$
$$

(2) ${10}^s s$
$$

(3) ${10}^{17} s$
$$

(4) ${10}^9 s$

The order of the magnitude of speed of light in Sl units is 

(1) 16

(2) 8

(3) 4

(4)  7

The most precise reading of the mass of an object, among the following is 

(1) 20 G

(2) 20. 0 g

(3) 20.01 g

(4) 20 $\times {10}^{0}g$

The most accurate reading of the length of  \(6.28\) cm long fiber is: 
1. \(6\) cm
2. \(6.5\) cm 
3. \(5.99\) cm 
4. \(60\) cm

Which of the following is the most precise measurement?

(1) $3\times {10}^{-3}m$
$$

(2) $0.0030 m$
$$

(3) $30\times {10}^{-4} m$
$$

(4) $300\times {10}^{-5} m$

The values of a number of quantities are used in a mathematical formula. The quantity that should be most precise and accurate in measurement is the one 

(1) Having smallest magnitude 

(2) Having largest magnitude 

(3) Used in the numerator 

(4) Used in the denominator