Physics (Part-II) (Railway)

Total Questions: 50

41. Which of the following statements is/are INCORRECT? [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-III]

A. The value of G on the moon is equal to that on the earth.

B. 26.68 x 10-¹¹ N is the force of gravitation between two point masses of 2 kg and 2 kg kept 1 m apart.

C. The value of G is one-sixth on the moon as compared to that on the earth.

D. Gravitational Force is inversely proportional to the square of the distance between two bodies

(1) Only A
(2) Only C and D
(3) B, C and D
(4) Only C

Correct Answer: (4) Only C

Solution:Newton's law of universal gravitation states that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. The gravitational constant denoted by the letter G, s a key quantity in Newton's law of universal gravitation.

42. A convex lens has a focal length of 30 cm. Calculate its power: [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-III]

(1) 2.00D
(2) 3.33D
(3) 2.33D
(4) 3.00D

Correct Answer: (2) 3.33D

Solution:The focal length

= 30 cm = 0.3 m

Power = (1/0.3) D = 3.33 D

43. During free fall of an object, which of the following decreases at any point in its path: [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-III]

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

Correct Answer: (1) Potential energy

Solution:An object can have both kinetic and potential energy at the same time. For example, an object which is falling, but has not yet reached the ground has kinetic energy because it is moving downwards and potential energy because it is able to move downwards even further than it already has.

As an object falls its potential energy decreases, while its kinetic energy Increases. The decrease in potential energy is exactly equal to the increase in kinetic energy.

44. What is the uneven distribution of light intensity due to the overwhelming power of two waves? [RRB RPP/RPSF SI Exam, 06.01.2019 Shift-II]

(1) Diffraction
(2) Coherence
(3) Upping
(4) Interfernce

Correct Answer: (4) Interfernce

Solution:Wave interference is the phenomenon that occurs when two waves meet while traveling along the same medium to form a resultant wave of greater, lower or the same amplitude. The wave interference is said to be a constructive wave interference if the crest of a wave meets the crest of another wave of the same frequency at the same point.

45. The dipole sludgge per unit rectangle is called: [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-II]

(1) Paraguay
(2) Electrical Dipole
(3) Bipolar Aggression
(4) Polarization

Correct Answer: (4) Polarization

Solution:Polarisation of medium p gives bipolar moment per unit volume.

• This is expressed in per square square pairing of unit.

• When an electric field is covered then it attains Polarisation which depends on electric field.

• Electric sensitivity is related to polarizing pair which is equal to P = XeV

46. The process of producing electric current through the variable magnetic field is called________. [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-II]

(1) Electrification
(2) Patience
(3) Electromagnetic Induction
(4) Parabolic

Correct Answer: (3) Electromagnetic Induction

Solution:Electromagnetic induction is a process where a conductor placed in a changing magnetic field (or a conductor moving through a stationary magnetic field) causes the production of a voltage across the conductor. This process of electromagnetic induction, in turn, causes an electrical cur rent, it is said to induce the current.

47. Which functionality is called as the percentage of total space filled with particles? [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-II]

(1) Packing Functionality
(2) Structural Functionality
(3) Laty Functionality
(4) Solid Functionality

Correct Answer: (1) Packing Functionality

Solution:The most efficient conformation atomic spheres can take within a unit cell is known as the closest packing configuration. Densely packed atomic spheres exist in two modes: hexagonal closest packing (HCP) and cubic closest packing (CCP).

48. Which lens of compound microscope forms the real inverted and large image? [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-lII]

(1) Objective
(2) Focal plane
(3) Focal length
(4) Eye Piece

Correct Answer: (1) Objective

Solution:Two convex lenses can form a microscope. The objective lens is positioned close to the object to be viewed. It forms an upside-down and magnified image called a real image because the light rays actually pass through the place where the image lies. The ocular lens, or eyepiece lens, acts as a magnifying glass for this real image. The ocular lens makes the light rays spread more, so that they appear to come from a large inverted image beyond the objective lens. Because light rays do not actually pass through this location, the image is called a virtual image.

49. Work process of "energy transfer rate" is [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-III]

(1) velocity
(2) force
(3) power
(4) speed

Correct Answer: (3) power

Solution:Power is the rate of doing work or of transferring heat, i.e. the amount of energy transferred or converted per unit time. Having no direction, it is a scalar quantity. In the International System of Units, the unit of power is the joule per second (J/s), known as the watt in honour of James Watt, the eighteenth-century developer of the condenser steam engine.

50. Ratio between hydraulic Tens ion and related uolunious tension is called.... [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-III]

(1) Compression
(2) Volumn Elastic
(3) Half Measurement
(4) Equivalent Measurement

Correct Answer: (2) Volumn Elastic

Solution:Bulk modulus is a measure of the ability of a substance to withstand changes in volume when under compression on all sides. It is equal to the quotient of the applied pressure divided by the relative deformation in volume.

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