Physics (Part-I) (Railway)

Total Questions: 50

31. The capacity to do work is called: [RRB ALP & Technician Exam, 13.08.2018 Shift-III]

(1) pressure
(2) force
(3) power
(4) energy

Correct Answer: (4) energy

Solution:Energy is the capacity to do work or to produce heat. Internal energy is the sum of kinetic energy and the potential energy.

32. The given symbol stands for a/an ________ in an electric circuit. [RRB ALP & Technician Exam, 14.08.2018 Shift-I]

(1) resistor
(2) plug key
(3) electric bulb
(4) battery

Correct Answer: (3) electric bulb

Solution:In an electric circuit, the Lamp/light bulb is denoted by the following symbol:

The electric bulb here represents the component of the electric circuit that is doing the work with the electrical energy of the cell. In this case the bulb uses the electrons to heat up the filament in the bulb and create light.

33. The speed of sound in air at 0°C is: [RRB ALP & Technician Exam, 14.08.2018 Shift-I]

(1) 331 ms-¹
(2) 330 ms-¹
(3) 330 ms
(4) 331 ms

Correct Answer: (1) 331 ms-¹

Solution:The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium.The speed of sound in air is approximately 331.5 m/s at 0 °C: 343 m/s at normal room temperature, which is at 20 °C: 346 m/s at 25 °C. The speed of sound in an ideal gas depends only on its temperature and composition.

34. Energy possessed by an object by its position or configuration is called: [RRB ALP & Technician Exam, 14.08.2018 Shift-I]

(1) Kinetic energy
(2) Nuclear energy
(3) Potential energy
(4) Electrical energy

Correct Answer: (3) Potential energy

Solution:Potential energy is the energy possessed in an object due to its position or its current state. It is literally the "potential" of an object to do work, which is the result of a force exerted over a distance. Among the different types of potential energy are the gravitational potential energy, elastic potential energy, and the chemical potential energy.

35. Plasma is formed in the stars because of very: [RRB ALP & Technician Exam, 14.08.2018 Shift-I]

(1) high temperature
(2) high pressure
(3) low pressure
(4) low temperature

Correct Answer: (1) high temperature

Solution:Plasma is the fourth state of matter that is made up of positively charged ions and negatively charged electrons In equal amount. It is hot ionized gas that is formed due to very high temperature of about 15 million degree at core of stars. Electrons are ripped out free in this state of matter as it is very hot.

36. If the distance travelled by an object is zero, then the displacement of the object: [RRB ALP & Technician Exam, 14.08.2018 Shift-III]

(1) is negative
(2) is zero
(3) is positive
(4) may or may not be zero

Correct Answer: (2) is zero

Solution:If the distance travelled is zero, it means that the per son never travelled from the initial position. The person or the body is at rest. Hence. It means that displacement is zero.

37. Which of the following can neither be created nor be destroyed? [RRB ALP & Technician Exam, 14.08.2018 Shift-III]

(1) Energy
(2) Power
(3) Velocity
(4) Momentum

Correct Answer: (1) Energy

Solution:The first law of thermodynamics, also known as Law of Conservation of Energy, states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another.

38. What is the type of Energy possessed by a stretched rubber band? [RRB ALP & Technician Exam, 14.08.2018 Shift-III]

(1) Chemical energy
(2) Potential energy
(3) Kinetic energy
(4) Thermal energy

Correct Answer: (2) Potential energy

Solution:Energy possessed by an object because of its position is called potential energy. A stretched rubber band possesses potential energy because of its position. Because of that energy, when the stretched rubber band is released it acquires its original position by movement.

39. A lens has a power + 2.0 D. The type of lens and its focal length will be______. [RRB ALP & Technician Exam, 14.08.2018 Shift-III]

(1) convex, -0.5 m
(2) concave, -0.5 m
(3) concave, 0.5 m
(4) convex, 0.5 m

Correct Answer: (4) convex, 0.5 m

Solution:The lens is convex lens as power is positive.

Power = 2d

Focal length = 1/p

1/2 m =0.5m

40. The characteristics of____________ is used in the breaking pads of cars. [RRB ALP & Technician Exam, 14.08.2018 Shift-III]

(1) Zero effect of friction
(2) Weight impulse force tension action
(3) negative effect of friction
(4) positive effect of friction

Correct Answer: (4) positive effect of friction

Solution:The characteristics of positive effect of friction is used in the breaking pads of cars. Brakes of vehicle will not work without friction.

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