Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd word from the given alternatives.

If θ is acute angle and sin(θ+18°)= 1/2, then the value of θ in circular measure is

The value of (1 - √2) + (√2 - √3) + (√3 - √4) + ..... + (√15 - √16) is

The 3rd and 8th term of an arithmetic progression are -13 and 2 respectively. What is the 14th term?

If x2 – 12x + 33 = 0, then what is the value of (x – 4)2 + [1/(x – 4)2]?

If cos 2π/3c = x, then the value of x is

ΔABC and ΔDEF are two similar triangles and the perimeter of ΔABC and ΔDEF are 30 cm and 18 cm respectively. If length of DE = 36 cm, then length of AB is

2sin[(C+D)/2].sin[(D­-C)/2] is equal to