ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is 1.66 m 1.66 x 10<sup>-10</sup>m 1.66 x 10<sup>-29</sup>cm 1.66 x 10<sup>-29</sup>m
2 Victor de-Brogile received the Nobel prize in physics in 1925 1929 1932 1935
3 0.1 kg mass will be equivalent to the energy 9 x 10<sup>15</sup>J 5 x 10<sup>8</sup>J 6 x 10<sup>16</sup>J 9 x 10<sup>-16</sup>J
4 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is 100 J 1.6 x 10<sup>-17</sup>J 100 eV 1.6 x 10<sup>-17</sup>eV
5 According to the de-Brogile relation, an object of large mass and ordinary speed has very small wavelength very large wavelength very small frequency all of these
6 Photocell is a device which converts chemical energy into electrical energy electrical energy into light energy heat energy into electrical energy light energy into electrical energy
7 In process of annihilation of matter, the two photons produced move in opposite direction to converse momentum charge energy mass
8 Pair production is the phenomenon in which matter is converted into energy energy is converted into matter light is converted into electrical energy electrical energy is converted into light
9 Position was discovered by Carl Anderson in 1920 1925 1928 1932
10 The existence of position was predicted by Dirace in 1920 1925 1930 1928
11 When a position comes close to an electron they annihilate into photons such that each photon has energy 0.51 Me v each photon has energy 1.02 Me v each photon has energy 0.25 Me v none of these
12 When a position comes close to an electron they annihilate into one photon two photons which travel in the same direction two photons which travels in the opposite direction two photons which travel in any direction
13 Converse of pair production is known as Compton effect annihilation of matter photoelectric effect none of these
14 In order to produce pair production, a photon must have a energy 0.511 Me v 0.256 Me v 1.02 Me v 0.956 Me v
15 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be 2.120<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°A</span> 0.212<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°A</span> 21.2<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°A</span> 0.14<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span><div><span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">a</span></div>
16 When a high energy photon interact with a metal, which of the following effect is most likely to be taken place pair production photoelectric effect Compton effect None of these
17 When low energy photon interact with a metal,which of the following effect is likely to be taken place pair production photoelectric Compton effect None of these
18 Compton was awarded Nobel prize in physics in 1921 1923 1925 1927
19 In the compton's effect, it is found that the wavelength of incident x-rays is greater than the wavelength of scattered x-rays equal to the wavelength of scattered x-rays less than the wavelength of scattered x-rays any one of these
20 Current is measured in volts watt ohm ampere
21 Resistance is measured in volts ampere ohm watt
22 Avo-meter is used of measure the current, voltage voltage, resistance resistance, current current, voltage and resistance
23 A resistance used in galvanometer to make it voltmeter is called shunt resistance high resistance zero resistance none of these
24 When a suitable small resistance is put in parallel with the galvanometer coil, it is converted into Voltmeter Avometer Ammeter None of these
25 A resistance used in voltmeter is called shunt resistance high resistance low resistance zero resistance
26 In order to make a voltmeter, high resistance is connected with galvanometer, in perpendicular may be paralled or pendicular series none of these
27 Which is modified form of galvanometer potentiometer battery voltmeter slide wire bridge
28 A voltmeter is used to measure the potential difference current temperature resistance
29 For measuring large currents, an ordinary galvanometer cannot be used without proper, then both relates with each other as modification voltage current resistance
30 A full-scale deflection is obtained in a galvanometer with a current of few ampere volts milliampere ohm
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