# RRB NTPC Physics quiz for Stage I : 18/03/2019

## RRB NTPC Physics quiz for Stage I

Railway/SSC JE Physics quiz for  (Phase I), RRB NTPC, SSC various exams and other competitive exams.

Q1. Which among the following determines the pitch of a sound?

(a) Amplitude

(b) Frequency

(c) Loudness

(d) Wavelength

Q2. Which phenomena show the particle nature of light?

(a) Diffraction

(b) Interference

(c) Photoelectric effect

(d) Polarization

Q3. Electric Motor converts _____ energy to mechanical energy.

(a) Sound

(b) Mechanical

(c) Chemical

(d) Electrical

Q4. Convex mirror is generally used in _____.

(a) Solar cookers

(b) Ophthalmoscope

(d) Rear view mirror

Q5. Barometer was invented by

(a) Evangelista Torricelli

(b) Charles Xavier Thomas

(c) Edward Teller

(d) Gustav Tauschek

Q6. ______ is the perpendicular distance between point of application of force and axis of rotation.

(a) Moment arm

(b) Moment of Inertia

(c) Altitude

(d) Base

Q7. Which among the following is not a unit of distance?

(a) Light year

(b) Candela

(c) Astronomical unit

(d) Parsec

Q8. The apparent weight of a person in a lift which is moving down with uniform acceleration is _______.

(a) greater than the weight when the person is stationary

(b) twice the weight when the person is stationary

(c) less than the weight when the person is stationary

(d) same as the weight when the person is stationary

Q9. Who invented Rocket?

(a) Rich K Goyle

(b) E M Forster

(c) Robert Goddard

(d) James Anderson

Q10. In which of the following processes is energy released?

(a) Respiration

(b) Photosynthesis

(c) Ingestion

(d) Absorption

Ans.1.(b)

Exp.  While frequency measures the cycle rate of the physical waveform, pitch is how high or low it sounds when you hear it. Pitch and Frequency are related to each other. A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave.

Ans.2.(c)

Exp. The photoelectric effect is an phenomenon in which the emission of electrons occurs when a beam of light strikes a metal or a cathode surface. For emissions of electrons frequency of incident light is required to be greater than a minimum value called Threshold Frequency. Thus, show particle nature of light.

Ans.3.(d)

Exp.An electric motor is an electrical machine that converts electrical energy into mechanical energy.

Ans.4.(d)

Exp. A convex mirror provides for a larger field of view than a plane mirror. They are used whenever a mirror with a large field of view is needed. For example, the passenger-side rear view mirror on a car is convex.

Ans.5.(a)

Exp. Evangelista Torricelli is universally accepted as inventor of Barometer. Charles Xavier Thomas invented mechanical calculator. Edward Teller is known as “the father of the hydrogen bomb”. Gustav Tauschek developed numerous improvements for punched card-based calculating machines.

Ans.6.(a)

Exp. The moment arm or lever arm is the perpendicular distance between the line of action of the force and the center of moments. Moment Arm is the perpendicular distance between point of application of force and axis of rotation.

Ans.7.(b)

Exp. Longsec is not the unit of distance.

Ans.8.(c)

Exp. The apparent weight of a person in a lift which is moving down with uniform acceleration is less than the weight when the person is stationary.

Ans.9.(c)

Exp. Robert Hutchings Goddard (October 5, 1882 – August 10, 1945) was an American engineer, professor, physicist, and inventor who is credited with creating and building the world’s first liquid-fueled rocket.

Ans.10.(a)

Exp. Respiration is the process in which energy is released.