# Railway Physics Quiz for RRB ALP Exam |RRB | 2nd JANUARY 2019

Get daily topic-wise Railway Quiz Questions and answers for various RRB exams like NTPC, JE, ALP, Group C and D. Free section-wise Indian railway quiz for RRB Exam.

Q1. At what temperature (in degree Celsius), the numerical values on Celsius and Fahrenheit scales become equal?

(a) –40

(b) 40

(c) 273

(d)–273

Q2. What is the process of conversion of solid state directly to gaseous state called?

(a) Evaporation

(b) Condensation

(c) Sublimation

(d) Distillation

Q3. When a ball is thrown vertically upwards, which of the following quantities remains constant during its motion?

(a) Acceleration due to gravity

(b) Displacement

(c) Velocity

(d) None of these

Q4. What is the SI unit of heat energy?

(a) Joule

(b) Newton

(c) Calorie

(d) Kelvin

Q5.If the orbit of a planet is an ellipse then what is the point at which the Sun is located called?

(a) Centre

(b) Circumcentre

(c) Incentre

(d) Focus

Q6. The laws which govern the motion of planets are called ___________________.

(a) Newton’s Laws

(b) Kepler’s Laws

(d) De Morgan’s Laws

Q7. Convex and concave mirrors are examples of ?

(a) Plane mirrors

(b) Spherical mirrors

(c) Inverted mirror

(d) Erect mirror

Q8. The frictional force exerted by fluids is also called ________.

(a) Drag

(b) Buoyancy

(c) Upthrust

(d) Convection

Q9. Which one of the following is a good electrical conductor?

(a) Graphite

(b) Diamond

(c) Peat

(d) Charcoal

Q10. Which of the following pair is incorrect?

(a) Hygrometer – Water vapour content of the atmosphere

(b) Lactometer – Specific gravity of liquids

(c) Anemometer – Speed of the wind

(d) Seismograph – Earthquakes

## Solution

Ans.1.(a)

Exp. At -40 degrees, the numerical values on Celsius and Fahrenheit scales become equal.

Ans.2.(c)

Exp. Sublimation is the phase transition of a substance directly from the solid to the without passing through the intermediate liquid phase.

Ans.3.(a)

Exp. When a ball is thrown vertically upwards Acceleration due to gravity remains constant during its motion.

Ans.4.(a)

Exp. Heat is the amount of energy that flows spontaneously from a warmer object to a cooler one. In SI system, heat energy is measured in joules (J).

Ans.5.(d)

Exp. The Sun and the planets move around each other with their center of mass lying at the focus of the elliptical orbits. In other words, if the orbit of a planet is an ellipse then the point at which the Sun is located called Focus.

Ans.6.(b)

Exp. The laws which govern the motion of planets are called Kepler’s law of planetary motion.

Ans.7.(b)

Exp. Concave and convex are two classes of spherical mirrors. A concave mirror is a spherical mirror in which the reflecting surface and the center of curvature fall on the same side of the mirror. On the other hand, a convex mirror is a spherical mirror in which the reflecting surface and the center of curvature lie on the opposite sides of the mirror.

Ans.8.(a)

Exp. Drag is a kind of frictional force exerted by fluid which opposes the motion of an object through that fluid. Drag force acts in direction opposite to the direction of motion of the object.

Ans.9.(a)

Exp. Graphite is a very good conductor of electricity due to the mobility of the electrons in its outer valence shells.

Ans.10.(b)

Exp. A lactometer is an instrument used to check purity of milk.

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