27) D

1 – Force = mass x acceleration (F = ma)

Force required = 4kg x 1.25 = 5N.

Hence statement 1 is correct.

2 – Speed = frequency x wavelength (c = ƒ x λ)

ƒ = c ÷ λ

4 = 5 ÷ 1.25

Hence statement 2 is correct.

3 – Voltage = Current x Resistance (V = IR)

However, 4 ≠ 5 x 1.25

5 x 1.25 = 6.25

So statement 3 is wrong.

Only statements 1 and 2 are correct. So the answer is D.

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