Which one is a valid declaration of a boolean?

Which one is a valid declaration of a boolean?

boolean b1 = 1;

boolean b2 = ‘false’;

boolean b3 = false;

boolean b4 = ‘true’

Answer : C

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1) Which of these occupy first 0 to 127 in Unicode character set used for characters in Java?

2) Literals in java must be appended by which of these?

L

I

D

L and I

3) Literal can be of which of these data types?

integer

float

boolean

all of the mentioned

4) In Java, the word true is ................

A Java keyword

A Boolean literal

Same as value 1

Same as value 0

5) Which of these can not be used for a variable name in Java?

identifier

keyword

identifier & keyword

none of the mentioned