The electricity resistivity of a few materials is given in ohm-metre. Which of these materials can be used for making element of a heating device ? `{:(A,6.84xx10^(-8)),(B,1.60xx10^(-8)),(C,1.00xx10^(-4)),(D,2.50xx10^(12)),(E,4.40xx10^(-5)),(F,2.30xx10^(17)):}` Give reason for your answer.
The electrical resistivities of a few materials are given in ohm.metre. Which of these materials can be used for making an element of a heating device ? (A) 6.84 xx 10^-8 (B) 1.60 xx 10^-8 ( C) 1.00 xx 10^-4 (D) 2.50 xx 10^12 ( E) 4.40 xx 10^-5 (F) 2.30 xx 10^17 .
Hardness of water is 200 ppm. The normality and molarity of CaCO_3 in the water is (a). 2xx10^(-6)(N,2xx10^(-6)M (b). 4xx10^(-2)N,2xx10^(-2)M (c). 4xx10^(-3)N,2xx10^(-3)M (d). 4xx10^(-1)N,2xx10^(-1)M
Express the following mathematical operations in scientific notation. (1) (7.7xx10^(4))+(0.77xx10^(5)) (2) (8.7xx10^(4))-(0.77xx10^(5))
3xx10^(5) + 4xx10^(3) + 7xx10^(2) + 5 is equal to
LAKHMIR SINGH & MANJIT KAUR-TEST PAPER 3-Section B
