RRB JE 23rd May 2019 Shift-3

The ultrasonic waves sent inside a metal block to find out an invisible crack or a hole in it is found using?

If $$\frac{x}{\sqrt{128}}$$=$$\frac{\sqrt{162}}{x}$$ then find the value of x

The difference between $$\frac{1}{3}$$and $$\frac{1}{4}$$of a number is equal to its square root. Find the number.

In this question, two statements are given followed by two conclusions. Choose the conclusion(s) which best fit(s) logically.
Statements:
1) Some papers are pens.
2) All pens are pencils.
Conclusions:
I. All pencils are pens.
II. Some papers are pencils.

Read the following information carefully and answer the question given below.
A, B, C, D, E, F, G and H are sitting around a circular table facing the centre. No two males or two females are immediate neighbours of each other. A is the wife of H and sits to the immediate left of H. A sits third to the left of E. F sits second to the right of D. D is not an immediate neighbour of A or E. H and C are immediate neighbours of each other. F is not an
immediate neighbour of his wife B.
How many people sit between B and F when counted in anti-clockwise direction from B?

Find the missing number in the following series. 7, 14, 56, (…), 2688, 26880

Reactions in which heat is given out along with the products are called?

Read the following information carefully and answer the question given below. 

During a party, a game is being played. For the game, 9 people from P to X (mix of boys and girls) have to stand in a vertical row. Boys are wearing blue helmets and girls are wearing green helmets. The row starts at top and with a green helmet. Boys and girls stand alternately in the row. Each position in the row can be occupied by one person only. 

i) P stands seven places before Q.
ii) Third green helmet is R.
iii) Second boy after R is S.
iv) Fourth place in the row is occupied by T.
v) U stands ahead of P.
vi) V stands between R and P.
vii) X is a girl.

Who among the following stands after X?

What is the GCD of these polynomials? $$(x^{3} + x^{2}+ x + 1)$$ and $$(x^{3} + 2x^{2} + x + 2)$$?

If a sum of money doubles itself in 4 years at a certain rate, when will it become 16 time itself at the same rate of Simple Interest?