**(Gujranwala Board 2007)**

2. If y is expressed in terms of a variable x as y = f(x), then y is called

**(Lahore Board 2005)**

3. If f: X ➝ Y is a function then y ∈ Y is called

**(Lahore Board 2006)**

4. x² + y² = 4 is

**(Lahore Board 2007)**

5. The function f(x) = ax² + bx + c has maximum value if

**(Lahore Board 2005)**

6. If y = f(x) is a function, then y is called

**(Lahore Board 2008)**

7. If f(x) = 2x + 5 then f (2) equals

**(Lahore Board 2007)**

8. If f(x) = xsec x, then f (0) =

**(Gujranwala Board 2005)**

9. If f: X ➝ Y is a function then X is called

**(Gujranwala Board 2005)**

10. The Linear function f (x) = ax + b is an identity function if

**(Gujranwala Board 2007)**

Q.31 A rule that assigns to each element x in X a unique element y in Y is called a function from

(a) X to X

(b) X to Y

(c) Y to X

(d) Y to Y

Q.32. A function from X to Y is denoted by

(a) f:X →X

(b) f:Y →X

(c) f:X →Y

(d) f:Y →Y

Q.33 A function from Y to X is denoted by

(a) f:X →X

(b) f:Y →X

(c) f:X →Y

(d) f:Y →Y

Q.34 A function f:X →Y is defined by f(x) = c , has the domain equal to: (Gujranwala Board. 2007)

(a) {c}

(b) R

(c) R-{c}

(d) X

Q.35 If y is expressed in terms of a variable x as y= f(x), then y is called

(b) implicit function

(c) linear function

(d) identity function

**(Lahore Board. 2005)**

Q.36 If f: X→Y is a function, then is called (Lahore Board, 2006)

(a) dependent variable of f

(b) independent variable of f

(c) range of f

(d) range of f

Q.37 If f: X→Y is a function, then the elements of X are called

(a) pre-images

(b) images

(c) constants

(d) ranges

Q.38 If f:X→Y is a function and , then

(a) f(x) = 1

(b)

(c)

(d)

Q.39 If f:X →f(X) is a function, then the elements of f(X) are called

(a) pre-images

(b) images

(c) constants

(d) ranges

Q.40 If y is an image of x under the function f, we write it as

(a) x = f (y)

(b) y = f (x)

(c) y = x

(d)

Q.41 is

(a) Function

(b) Not function

(c) Ellipse

(d) Line

**(Lahore board, 2007)**

Q.42 The function has maximum value if

(a) a > 0

(b) a < 0

(c) a > 1

(d) a > 2

**(Lahore board, 2007)**

Q.43 If is a function then

(a) f(x) = x

(b) f(x) = x²

(c) f(x) = x³

(d) f(x) = -x²

Q.44 If is a function then f( 2 ) =

(a) -4

(b) -2

(c) 2

(d) 4

Q.45 If is a function then f( -2 ) =

(a) -4

(b) -2

(c) 2

(d) 4

Q.46 If is a function then f( -2 ) =

(a) -4

(b) -2

(c) 2

(d) 4

Q.47 If is a function then f( 2 ) =

(a) -4

(b) -2

(c) 2

(d) 4

Q.48 If y = f ( x ) is a function, then y is called

(a) dependent variable

(b) constant

(c) independent variable

(d) none of these

**(Lahore board, 2008)**

Q.49 If is a function then f( 2 ) =

(a) 8

(b) -2

(c) 2

(d) -8

Q.50 If is a function then f( 2 ) =

(a) 8

(b) -2

(c) 2

(d) -8

Q.51 If is a function then f( -2 ) =

(a) 8

(b) -2

(c) 2

(d) -8

Q.52 If is a function then f( 3 ) =

(a) 0

(b) 3

(c) 6

(d) 7

Q.53 If

(a) 1

(b) 9

(c) -9

(d) -1

**(Lahore board, 2007)**

Q.54 If is a function then f( 4 ) =

(a) 0

(b) 3

(c) 6

(d) 7

Q.55 If is a function then f( 1 / 2) =

(a) – 7 / 2

(b) – 5 / 2

(c) – 3 / 2

(d) – 1 / 2

Q.56 If is a function then f( 0 ) =

(a) -1

(b) 0

(c) 1

(d) 2