A transformer with 100 primary turns and 500 secondary turns is a MCQ with Answer and Explanation

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A transformer with 100 primary turns and 500 secondary turns is a

A. Step-up transformer

B. Auto transformer

C. Step-down transformer

D. Isolation transformer

Answer: Option A

Solution (By JKSSB Mock Tests)

Ns > Np => step-up. Vs > Vp.

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A projectile is launched at 30° with speed 20 m/s. Horizontal range is: (g=10 m/s²)

A. 40 m

B. 20 m

C. 20√3 m

D. 10√3 m

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Correct Answer: Option C

Explanation:
Range R = u²sin(2θ)/g = (20)²×sin(60°)/10 = 400×(√3/2)/10 = 20√3 m. Formula applies for level ground projection. Memory tip: sin(2θ) for θ=30° is sin60°=√3/2. Standard projectile calculation frequently appearing in competitive exams with trigonometric values.

This question belongs to: Science Physics