Question
Which British scientist is known for developing the
principle of holography in 1947 to improve the resolution of the electron microscope?Solution
The correct answer is C
Sum of the present ages of A, B, C and D is 54 years. After 3 years ratio of their ages is 4:3:2:2. What is C’s present age?
The perimeter of 3 squares is 18 cm, 27 cm and 36 cm respectively. What will be the area of the square having perimeter equal to sum of edges of 3 squar...
Present age of ‘A’ is 25% more than that of ‘B’. If 9 years hence from now, ‘B’ will be 6 years younger than ‘A’, then find the sum of p...
Five years from now, the age of Arjun will be 28 years. Six years from now, the ratio of ages of Arjun and Varun will be 4:5 respectively. After how man...
Difference between the ages of A and B is same as the difference between the ages of B and C. The difference between the ages of A and C is 7 years. If ...
The present ages of 'Isha' and 'Riya' are in the ratio 5:6. Two years from now, Isha’s age will be 20% less than Riya’s age. What is Isha’s curren...
The current age of 'P' is 40% more than the current age of 'Q'. Seven years from now, the ratio of their ages will be 14:11. What...
B is 5 years older than A and A is 7 years older than C. If the sum of the age of A and C is 21 years, then find the sum of the ages of all three.
The average age of Rohit’s parents is 42 years. The ratio of his father and mother’s age is 4 : 3 respectively. Find his mother’s age?
After 5 years, the age of Seema will be 3 years less than 3 times of her age, 4 years back. What is Seema’s present age?
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