ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 Gaussian surface is always: Rectangular Spherical Cylinder Box shape Any of these
2 According to Huygen's principle light travels in straight line Light is a transvers wave Light has dual nature All points on the primary wave-front are the sources of secondary wavelets
3 The cause of mirage observed in deserts in bright sunlight is due to Refraction of light Reflection of light Scattering of light Total internal reflection of light
4 Coulomb multiplied by volt by volt gives the unit called: farad Ohm Second joule Watt
5 The velocity of light in vacuum can be changed by changing Frequency Amplitude Wavelength None of these
6 The image of the tip of a needle is never sharp because of Polarization of light Interference of light Diffraction of light Reflection of light
7 Which one the following gives three regions of electromagnetic spectrum in order of increasing wavelength? Gamma rays, micro waves, visible light Radio waves, ultraviolet waves, X-rays Ultraviolet rays, infrared rays, micro waves Visible light, gamma rays, radio waves
8 Huygen's theory cannot explain Diffraction Interference Polarization Photoelectric effect
9 The contrast in the fringes in an interference pattern depends upon Fringe width Relative difference intensities of the two sources Distance between the slits Wavelength
10 Static electricity is produced by the transfer of: Electrons Protons One fluid Two fluid None of these
11 If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity Fringe width will decrease Fringe width will increase Fringe width will remain unchanged Fringe will become less intense
12 The electric field lines start from: Positive charge Negative charge Either A and B Neutron An atom
13 Which one of the following phenomenon cannot be explained on the bases of Huygen's theory Refraction Reflection Diffraction Formation of spectrum
14 The photocopying process is called: Geography Sonography Xerography Zerography None of these
15 Light appears to travel in straight line because It is not absorbed by the atmosphere It is refracted by the atmosphere Its wavelength is very small Its velocity is very large
16 Selenium is: An insulator A conductor Both A and B Excellent conductor None of these
17 Stars twinkle due to The fact that they do not emit light continuously The refractive index of earth's atmosphere fluctuates The Star's atmosphere absorbs its light intermittently None of these
18 The inkjet printer eject a thin stream of: Water Oil Ink Any above None of these
19 A prism splits a beam of white light into seven component colors. This is so because Phase of different colors is different Amplitude of different colors is different Wavelength of different colors is different Velocity of different colors is different
20 If the distance between two charges is doubled,the force between them will become: Double Half One third One fourth
21 The number of countries who manage the largest satellite system is: 3 24 126 200
22 Velocity of particle executing SHM will be maximum at Extreme position Mean position b/w mean and extreme None
23 Satellites are held in orbits around Earth by its: Gravitational field Magnetic field Own orbital motion Own spin motion
24 Which one is related to angular motion: Moment of a force Moment of inertia Moment of momentum None of these
25 Angular momentum is a: vector quantity Imaginary quantity Complex Quantity Scalar Quantity
26 Direction of angular momentum is determined by: Right hand rule Head to tail rule Left hand rule None of them
27 A particle executes SHM with frequency. The frequency with which its K.E oscillates is f/2 2f f 4f
28 A disc rolls down a hill and its speed at bottom is found to be 11.4 m/sec. Height of the hill is then nearly: 10 m 12 m 13 m 15 m
29 Which of the following quantity for particle executing SHM is non-zero at mean position Force Acceleration Velocity Displacement
30 A particle moving uniformly along circle its projection along diameter performs Linear motion Projectile motion SHM Rotatory motion
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