Question
The ratio of the present ages of father and his son is
9:5. The product of their ages 3 years ago was 33 times of his son’s age that year. What was son’s age 3 year ago?Solution
Let present age of father and son be 9x and 5x respectively. According to question, => (9x – 3) (5x – 3) = 33 × (5x – 3) => (9x – 3) = 33 => 9x = 36 => x = 4 Therefore, son’s age 3 years ago = (5x – 3) = 17 years
Which of the following is an example of symbiosis?
What is the product of the reaction?
CH₃COOH + CH₃OH → (H⁺, heat)
In a nuclear reactor, one of the following is used as a fuel.
1 mole of carbon atoms = ______ g of carbon atoms
Two capacitors of capacitance 6 µF and 3 µF are connected in series across a battery of constant voltage.
The charges stored on the two capaci...
Group number and valency have no relation in
In Bohr’s model of the hydrogen atom, electrons in “stationary” orbits do not emit radiation continuously because:
The primary reason that smoking cigarettes is bad for our health is that cigarette smoke _______.
Chemical equation is balanced according to the law of
Consider the following statements regarding antibiotics
1. They are used to destroy disease-causing bacteria.
2. They can be applied to th...
