Answer: D) 3 Explanation: Given teacher drinks 9 ltrLet number of boys be 'A'.Let number of girls be 'B'.Boy drinks 7 ltr and girl drinks 4 ltrAfter class total water consumed = 42 ltrThen,9 + 7A + 4B = 42=> 7A + 4B = 33By trial and error method,The only integers which satisfy the equation is A = 3 and B = 3Therefore, number of girls in the class = 3.

Answer: B) 420 Explanation: Given total number of students in the class = 21   So each student will have 20 greeting cards to be send or receive (21 - 1(himself))   Therefore, the total number of greeting cards exchanged by the students = 20 x 21 = 420.

Answer: A) Dipak Misra Explanation:

Answer: A) 30 Explanation: Then, A:B = 2:3 and B:C = 5:8= (5 x 3/5) : (8 x 3/5) = 3:24/5A:B:C = 2:3:24/5= 10:15:24 => B = 98 x 15/49 = 30.

Answer: A) atrial depolarization Explanation: The P wave in the ECG represents atrial depolarization, which results in atrial contraction, or atrial systole. The P wave is a summation wave generated by the depolarization front as it transits the atria.

Answer: D) Sidney Sheldon Explanation:

Answer: B) Shankha Ghosh Explanation: Shankha Ghosh, the outstanding Bengali writer, commentator and academician, has been chosen for the prestigious 52nd version of the Jnanpith Award (2016) by the Government of India (GoI) for his lovely phrase and tries different things with different beautiful structures check his significance as an imaginative ability.The Jnanpith Award is presented every year to a literary figure for their outstanding contribution in literature. The honor conveys a reference, prize cash of Rs. 12 lakh and a bronze imitation of Goddess Saraswati.He turned into the sixth Bengali creator to win India's most astounding artistic honor after Mahasweta Devi, Tarashankar Bandopadhyay, Ashapurna Devi, Subhash Mukhopadhyay and Bishnu Dey.

I am History.   Yes, history refers to all the past, but we can create history in the presentand it cannot be polluted in the future.