Railway Exams (RRB) - General Science

Mechanics, Heat, Sound, Light & Electricity question bank (Physics (Class 10 CBSE Standard))

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Q1.

Physics (Mechanics & Energy): A train of mass $2 \times 10^5\text{ kg}$ is accelerated from rest to $20\text{ m/s}$ in 'Units of Measurement, SI Units and Measuring Instruments'. What is the total kinetic energy gained by the train?

(A)

$4 \times 10^7\text{ Joules}$ ($KE = \frac{1}{2} m v^2 = \frac{1}{2} \times 2 \times 10^5 \times 400$) (Units of Measurement, SI Units and Measuring Instruments)

(B)

$2 \times 10^7\text{{ Joules}}$

(C)

$8 \times 10^7\text{{ Joules}}$

(D)

$4 \times 10^6\text{{ Joules}}$

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Q2.

Life Sciences (Physiology): Which part of the human brain controls involuntary life-support activities such as breathing, heart rate, and blood pressure in 'Units of Measurement, SI Units and Measuring Instruments'?

(A)

Medulla oblongata (Hindbrain) (Units of Measurement, SI Units and Measuring Instruments)

(B)

Cerebrum

(C)

Cerebellum

(D)

Hypothalamus

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