What device is mainly used to convert digital signals

If the signs ‘+’ and ‘÷’ are interchanged, then which of the following equations can be correctly balanced?

In a certain code language, '893' means 'Shahid likes cakes', '137' means 'cakes are delicious', and '274' means 'we are girls'.

If a mirror is placed on the shaded line, which of the following options is the correct image of the given figure?

Select the missing characters from the given responses.

BADC : FHEG :: NPMO : ?

Select the option that can replace the question mark (?) in the following series.

L34E, O46H, R58K, U70N, ?

Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

_ c _ d d _ c a _ c b d d b _ a

Which of the following diagrams exhibits the most appropriate relation between Employee, Managers and Engineers?

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the odd letter-cluster.

The given Venn diagram shows the number of students who can read English, Hindi and French. How many of them can read French?

Answer these questions based on the following information.

There are 4 red balls, 4 green balls and 6 blue balls, in a box