You are given four bulbs of 25 W, 40 W, 60 W, and 100 W of power, all operating at 230 V. Which of them has the lowest resistance?
(A) 25 W
(B) 40 W
(C) 60 W
(D) 100 W
1 Answers
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Let `a_(1), a_(2),….` and `b_(1),b_(2),….` be arithemetic progression such that `a_(1)=25`, `b_(1)=75` and `a_(100)+b_(100)=100`, then the sum of firs
Correct Answer - C `(c )` `(a_(100)+b_(100))-(a_(1)+b_(1))=99dimpliesd=0` `:.` Sum of series `=(100//2)(a_(100)+b_(100)+a_(1)+b_(1))` `=50(100+100)` `=10000`
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Given four pair of gloves, they are distributed to four persons. Each person is given a right-handed and left-handed glove, then the probability that
Correct Answer - A `(a)` Let us first distribute `4` left gloves to four person in `4!` ways. If no one gets the corresponding right glove then no. of ways `=4!(1-(1)/(1!)+(1)/(2!)-(1)/(3!)+(1)/(4!))=9`...
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A box has 100 bulbs out of which 10 are defective. The probability that out of a sample of 5 bulbs, none is defective, is
Correct answer is (C) (9/10)5
2 Answers 1 views
A circuit with `R=70 Omega` in series with a parallel combination of L=1.5H and `C=30 mu F` is a driven by a 230 V supply of angular frequency `300 ra
Correct Answer - `(a) 163.3 Omega (b) 1.414 A (c )0.653 A (d) Circuit current becomes zero
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There is a box containing 30 bulbs of which 5 are defective. If two bulbs are chosen at random from the box in succession without replacing the first,
Correct Answer - `2/87`
2 Answers 1 views
It is known that a box of 800 electric bulbs contains 36 defective bulbs . One bulb is taken at random of the box. What is the probability that the bu
Correct Answer - `(191)/(200) `
2 Answers 1 views
Veto power means A) Gaining power B) To accept C) To extend D) A power to reject
D) A power to reject
2 Answers 2 views
Two bulbs have ratings 100 W, 220 V and 60 W, 220 V. Which of the following statement is true.
C) The bulb 60 W has greater resistance than 100 W
2 Answers 1 views
Three ducks and two ducklings weigh 32 kg. Four ducks and three ducklings weigh 44 kg. All ducks weigh the same and all ducklings weigh the same
The correct option is (A) 20 kg. Lets weight of Duck = D and weight of duckling = d. 3D + 2d = 32 4D + 3d = 44 multiply first by 3, second by 2 9D...
2 Answers 1 views
An electric heater takes 6 A current from a 230 V supply line, calculate the power of the heater and electric energy consumed by it in 5 hours.
Given: I = 6 A, V = 230 V, t = 5 hours To find: Power (P), Energy consumed Formulae: i. P = IV ii. Energy consumed = power × time Calculation: From formula...
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