One ampere is equal to
`(1 C//s, 1C xx 1s, 1J xx 1C, 1 J//C)`

Let vec a = hat i + hat j + hat k, vec b = hat i + 4 hat j - hat k, vec c = hat i + hat j + 2 hat k and hat s be a the unit vector the magnitude of the vector (vec a .vec s)(vec b xx vec c) + (vec b. vec s)(vec c xx vec a) + ( vec c.vec s)(vec a xx vec b) is equal to (A) 1 (B) 2 (C) 3 (D) 4

A black body radiates energy at the rate of 1 xx 10 J // s xx m at temperature of 227 ^(@)C , The temperature to which it must be heated so that it radiates energy at rate of 1 xx 10 J//sm , is

At 27^(@) C and 37^(@) C , the specific rates of a reaction are given as 1.62 xx 10^(-2) s^(-1) and 3.2 xx 10^(-2) s^(-1) . Calculate the energy of activation for the given reaction.

A refrigerator converts 1.3 kg of water at 20^(@)C into ice at -15^(@)C in 1 hour. Calculate the effective power of the refrigerator. Specific latent heat of fusion of ice = 3.4 xx 10^(5) J kg^(-1) Specific heat capacity of water = 4.2 xx 10^(3) J kg^(-1) K^(-1) Specific heat capacity of ice = 2.1 xx 10^(3) J kg^(-1) K^(-1)

For the reaction of H_(2) with I_(2) , the constant is 2.5 xx 10^(-4) dm^(3) mol^(-1)s^(-1) at 327^(@)C and 1.0 dm^(3) mol^(-1) s^(-1) at 527^(@)C . The activation energy for the reaction is 1.65 xx 10x J//"mole" . The numerical value of x is __________. (R = 8314JK^(-1) mol^(-1))

A B J H , J D E F , A C E G are squares. (B C)/(A B)=3 . (A r e a B C D J)/(A r e a H J F G)=? (FIGURE) 1/9 (b) 1/3 (c) 1 (d) 3