ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons Frequency Penetrating power Energy Method of creation
2 The emf is measured in: Newton Volt J/C Both A and B Both B and C
3 The quantity having the same unit as that of emf is: Force Energy Potential Current Charge
4 Which instrument is expensive and difficult to use? Voltmeter Potentiometer CRO Both A and C Both A and B
5 An ideal voltmeter has: Zero resistance Small resistance Large resistance Infinite resistance Both A and B
6 Kirchhoff's first rule is also called: Loop rule Thumb rule Point rule Right hand rule None of these
7 X-rays produced in a tube operating at 105V. The speed of X-rays produced is 3 x 10<sup>8</sup>m/s 3.1 x 10<sup>8</sup>m/s 2.8 x 10<sup>8</sup>m/s 1.88 x 10<sup>8</sup>m/s
8 The third band of the colour code: Gives the number of zeroes Is decimal multiplier Gives the resistance tolerance Gives the third digit Both (A) and (B)
9 In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is Helium Neon Both None of these
10 A rheostat can e used: As variable resistor As potential divider For varying the current All of these None of these
11 The value of the metastable state for Neon is 20.66eV 20.61eV 19.23eV 18.70eV
12 In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them Small Greater Equal Sometimes
13 The best conductor is: Silver Copper Aluminimum Both B and C None of them
14 X-ray are also known as Roentgen rays Maxwell rays Plank range Einstein rays
15 As the current flows through the wire It generates heat in the wire It produces sound in the wire Resistance of the wire decrease Voltage across the ends is the increase None of these
16 The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is 1.24 x 10<sup>-10</sup>m 7.92 x 10<sup>-20</sup>m 2.78 x 10<sup>-14</sup>m 3.88 x 10<sup>-11</sup>m
17 CT scanning is the abbreviated name of Computed Technology Computed Technique Computed Technology Computerized Technique
18 The first shell near the neucles is L-shell X-shell N-shell M-shell
19 The fourth band is a: Silver band Red band Gold band Either A or C Either A or B
20 The life time of metastable state is equal to Life time of excited state Greater than by excited state Zero Less than by excited state
21 We can excite an atom by Bombardment of particles Radiating photons Providing potential difference All answer are true
22 The value of resistivity is the least for: Copper Aluminimum Silver Tungsten Iron
23 In a metal, the valence electrons are: Attached to individual atoms Not attached to individual atoms Free to move within the metal Both A and B Both A and C
24 Ultraviolet region lies in ______ series Layman Balmer P fund B racket
25 In gases, the charge carriers are: Electrons Positive ions Negative ions Both A and C Both A and B
26 Graph of Black body radiation is example of Band spectra Continuo's spectra Line spectra All
27 Photons must have energy equal to ev En hf None of these
28 In order to get interference using two light rays The sources should be monochromatic and coherent The sources should have the same frequency Superposition should be linear All of these
29 The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called Diffraction Interference Polarization Dispersion
30 The locus of all points in a medium having same phase of vibration is called Crest Trough Wavelength Wave-front
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