In a quiz competition, 4 marks are given for every correct answer and (-2) marks are given for every incorrect answer. W a. Rakhi scored 28 marks. If she got 10 correct answers, how many questions did she answer incorrectly? b. Alok got 5 correct answers. If he scored (-16) marks in the competition, how many questions did he answer incorrectly? [4] 4
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1
Answer:
A small body starts sliding down an inclined plane of inclination theta whose base length is equal to l . the coefficient of friction between the body and the surface is 'u'. if the angle theta is varied keeping 'l 'constant at what angle will the time of sliding be least
Answered by
1
Answer:
Explanation:
Every correct answer=4
incorrect =-2
A-
Rakhi score=28
correct =10
correct marks=10 x 4=40
so incorrect =40-28 =12
=12/2
=6
incorrect answers= 6
B-
correct =5 answers
scored =-16
according to us he should score=5 x 4 =20 ,but scored =-16
incorrect =20-(-16)
= 20+16
=36
incorrect answers=36/2
= 18
Hope u understand the ques
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