Related Questions

You and I _ goo frieds. Fill in the gap with the appropriate verb.
A is
B are
C was
D has
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
A $${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months
B It will completely disintegrate in two months
C It will completely disintegrate in four months
D $${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months
A man sells chocolates which are in the boxes. Only either full box or half a box of chocolates can be purchased from him. A customer comes and buys half the number of boxes which the seller had plus half box more. A second customer comes and purchases half the remaining number of boxes plus half a box. After this the seller is left with no chocolate boxes. How many chocolate boxes the seller had initially?
A 2
B 3
C 4
D 3.5
E None of these
A bird under controlled diet is fed daily 300 grams of a mixture of two foods: food A and food B. Food A contains 10% protein and food B contains 15% proten. If the bird's diet provides exactly 38 grams of protein daily, how many grams of food A are there in the mixture?
A 100
B 140
C 150
D 160
A bird under controlled diet is fed daily 300 grams of a mixture of two foods; food A and food B, Food A contains 10% protein and food B contains 15% proten. If the bird's diet provides exactly 38 grams of protein daily. how many grams of food A are there in the mixture?
A 100
B 140
C 150
D 160
The time required for half of the __________ of a radioactive isotope to decay is called its half life.
A Nuclei
B Electrons
C Protons
D Neutrons
A student loses a mark for every wrong answer and scores 2 marks for every correct answer. If he answers all the 60 questions in an exam and scores 39 marks, how many of them were correct ?
A 31
B 37
C 33
D 27
A student loses 1 mark for every wrong answer and scores 2 marks for every correct answer. If he answers all the 60 questions in an exam and scores 39 marks , how many of them were correct?
A 33
B 31
C 27
D 37
A student loses I mark for every wrong answer and scores 2 marks for every correct answer . If he answers all the 60 questions in an exam and scores 39 marks , how many of them were correct?
A 27
B 31
C 33
D 37
A student loses 1 mark for every wrong answer and scores 2 marks for every correct answer . If he answers all the 60 questions in an exam and scores 39 marks , how many of them were correct ?
A 33
B 31
C 27
D 37

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