Zero error in an instrument introduces 

(1) Systematic error 

(2) Random error 

(3) Least count error 

(4) Personal error 

A packet contains silver powder of mass 20.23 g $\pm$ 0.01 g. Some of the powder of mass 5.75 g $\pm$ 0.01 g is taken out from it. The mass of the powder left-back is 

(1) 14.48 g $\pm$ 0.00 g 

(2) 14.48 $\pm$ 0.02 g

(3) 14.5 g $\pm$ 0.1 g

(4) 14.5 g $\pm$ 0.1 g

The radius of a sphere is (2.6 $\pm$ 0.1) cm . The percentage error in its volume is 

(1) $\frac{0.1}{2.6}\times 100\%$

(2) $3\times \frac{0.1}{2.6}\times 100\%$

(3) $\frac{0.1}{3\times 2.6}\times 100\%$

(4) $\frac{0.1}{2.6}\%$

We can reduce random errors by 

(1) Taking large number of observations  

(2) Corrected zero error 

(3) By following proper technique of experiment 

(4)  Both (1) & (3) 

The volume of a cube having sides 1.2 m is appropriately expressed as 

(1) $1.728\times {10}^6 c{m}^3$
$$

(2) $1.7\times {10}^6 c{m}^3$
$$

(3) $1.8 \times {10}^6 c{m}^3$
$$

(4) $1.73 \times {10}^6 c{m}^3$

The number of significant figures in a pure number 410 is 

(1) Two 

(2) Three 

(3) One 

(4)  lnfinite 

The addition of three masses 1.6 g , 7.32 g and 4.238 g, addressed up to proper decimal places is 

(1) 13.158 g

(2) 13.2 g

(3)  13.16 g

(4) 13.15 g

The area of a sheet of length \(10.2~\text{cm}\) and width \(6.8~\text{cm}\) addressed up to the proper number of significant figures is:
1. \( 69.36 ~\text{cm}^2 \)
2. \( 69.4~\text{cm}^2 \)
3. \(69~\text{cm}^2 \)
4. \(70~\text{cm}^2 \)

The uncertain digit in the measurement of a length reported as 41.68 cm is 

(1) 4

(2) 1

(3) 6

(4)  8

The number of significant figures in the measured value 0.0204 is 

(1) Five 

(2) Three

(3) Four 

(4) Two