**1.**

**Statement - 1**

If the accelerating potential in an X-ray tube is increased, the wavelengths of the characteristic X-rays do not change.

Because

**Statement - 2**

When an electron beams strikes the target in an X-ray tube, part of the kinetic energy is converted into X-ray energy.

(A) Statement – 1 is True, Statement – 2 is True; Statement – 2 is a correct explanation for

statement – 1

(B) Statement – 1 is True, Statement – 2 is True; Statement – 2 is Not a correct explanation for

Statement – 1.

(C) Statement – 1 is True, Statement – 2 is False

(D) Statement – 1 is False, Statement – 2 is True

**2.**

When 20 g of naphthoic acid (C-11 H-8 O-2) is dissolved in 50 g of benzene [K(f) = 1.72 K kg mol^ -1], a freezing point depression of 2 K is observed. The van’t Hoff factor (i) is

(A) 0.5

(B) 1

(C) 2

(D) 3

**3.**

Tangents are drawn from the point (17, 7) to the circle x^2 + y^2 = 169.

**Statement - 1**

The tangents are mutually perpendicular.

Because

**Statement - 2**

The locus of the points from which mutually perpendicular tangents can be drawn to the given circle is x^2 + y^2 = 338.

(A) Statement – 1 is True, Statement – 2 is True; Statement – 2 is a correct explanation for statement – 1

(B) Statement – 1 is True, Statement – 2 is True; Statement – 2 is Not a correct explanation for Statement – 1.

(C) Statement – 1 is True, Statement – 2 is False

(D) Statement – 1 is False, Statement – 2 is True

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