ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 The conventional current is the name given to current due to flow of Positrons Positive charges Negative charges Both A and C None of these
2 In case of metallic conductors, the charge carriers are Protons Electrons Antiprotons Positrons Both A and B
3 The results of spectra obtained by Blamer were expressed in 1896 by Bohr Rydberg Planck Rutherford Coulomb
4 The range of wavelengths of colurs in the visible colours is 140 nm to 456 nm 10 nm to 56 nm 410 nm to 656 nm 910 nm to 956 nm None of these
5 Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is Less than atmospheric pressure Much less than atmospheric pressure Greater than atmospheric pressure Much greater than atmospheric pressure Both C and D
6 Field lines are closer to each other in the region where the filed is Stronger Weaker Much weaker Absent None of these
7 Electric field lines emerge from the charges in One dimension Two dimensions Three dimensions Four dimensions None of these
8 The value of relative permittivity of different dielectrics are Equal Different Greater than one Smaller than one Both B and C
9 By placing a dielectric in between the charges, the electrostatic force between them Is always reduced Is always increased Is not affected Is increased one million times None of these
10 Electric lines of force Intersect each other Are always parallel Are always anti-parallel Never intersect None of these
11 The electric field lines start from Positive charge Negative charge Either A or B Neutron An atom
12 The SI unit of charge is Ampere Watt Coulomb Volt Joule
13 The intensity at a point due to a charge is inversely proportional to Amount of charge Size of the charge Distance between charge and the point Square of the distance from the charge None of these
14 Electric intensity at a place due to a charged conductor is a Scalar quantity Vector quantity Semi vector and semi scalar Dimensionless quantity Both A and D are true
15 Electric field strength is defined as Work done on unit charge Force exerted on unit charge Distance covered by unit charge Power exerted by unit charge None of these
16 Referring to above figure, due to change in current in the coil P, the change in magnetic flux Is associated with coil P Is associated with coil S Causes and induced current in coil S All of these None of these
17 Referring to above figure, current in coil P falls from its maximum value to zero At the instant the switch is closed At the instant the switch is opened When switch is kept open When switch is kept closed None of these
18 Referring to above figure, current in the coil P grows from zero to its maximum value At the instant the switch is closed At the instant the switch is opened When switch is kept open All of above Neither of above
19 A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when The coil is distorted The coil is rotated The coil is neither distorted nor rotated Both A and B None of these
20 Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current Of same magnitude in the same direction Of different magnitude in the same direction Of same magnitude but in opposite direction Of different magnitude in the opposite direction None of these
21 When there is no relative motion between the magnet and coil, the galvanometer indicated No current in the circuit An increasing current A decreasing current A constant current Either B or C
22 The magnitude of induced emf depends upon the Rate of decrease of magnetic field Rate of change of magnetic field Rate of increase of magnetic flux Constancy of magnetic field None of these
23 Michael Faraday and Joseph Henry belong respectively to USA and England England and France England and USA USA and France None of these
24 In magnet-coil experiment, emf can be produced by Keeping the coil stationary and moving the magnet Keeping the magnet stationary and moving Relative motion of the loop and magnet Any one of above All above
25 The induced current in the loop can be Increased by Using a stronger magnetic field Moving the loop faster Replacing the loop by a coil of many turns All above Both A and B
26 The body oscillates due to ______ accelerates and overshoots the rest position due to _______ Applied force, Inertia Restoring force, Friction Frictional force, Inertia Restoring force, Inertia
27 Amplitude in SHM is equivalent to ______ in circular motion Diameter Radius Circumference None of these
28 The graph showing the variation of displacement with time is a Sine curve Straight line Parabola None of these
29 When a body is vibrating, the displacement from mean position Increases with time Decreases with time Changes with time None of these
30 The restoring force is ______ and opposite tot he applied force within ______ Equal, Elastic limit Different, The walls of the laboratory Different, Elastic limit None of these
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