ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 At constant temperature, if the density of the gas is increased, its pressure will: One kg of a substance Unit volume of a substance One mole of a substance None of these
2 The motion of molecules in gases is: Orderly Random Circular All of these
3 In an ideal gas, the molecules have: Kinetic energy only Potential energy only Both KE and PE None of these
4 Which of the following does not have the same units: Work Heat Kinetic energy Power
5 The temperature scale approved in SI units is: Celsius scale Kelvin scale Fehrenheit scale None of these
6 In the theory of dimensional analysis, heat may be properly represented by: ML<sup>2</sup>T<sup>-2</sup> MT<sup>-2</sup> ML<sup>-1</sup>T<sup>-1</sup> None of these
7 The only significant motion possessed by the mono-atomic gas represented is: Translatory Rotatory Vibratory None of these
8 At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes: Double Remains constant Half None of these
9 Real gases strictly obey gas law at: High pressure and low temperatures Low pressures and high temperatures High pressures and high temperatures None of these
10 A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called: Ideal gas Inert gas Real gas None of these
11 When two objects come to common temperature, the body is said to be in: Static equilibrium Dynamic equilibrium Thermal equilibrium None of these
12 Absolute zero is considered as that temperature at which: All liquid become gases All gases become liquid Water freezes None of these
13 Hotness and coldness of an object is represented in terms: Heat Temperature Chemical energy None of these
14 Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be: 6 x 10<sup>-5</sup>rad 7 x 10<sup>-5</sup>rad 8 x 10<sup>-5</sup>rad None of these
15 In the formula R = N x m for diffraction grating, N denotes: No. of lines/cm No. of lines/meter Total number of lines None of above
16 A grating with high resolving power can distinguish _______ difference in wavelengths : Larger Zero None of these Smaller
17 A grating with high resolving power can distinguish _______ difference in wavelengths : Smaller Larger Zero None of these
18 Resolving power in mth order diffraction for grating is given by: R = m/N R = N x m None of these R = N/m
19 Resolving power in mth order diffraction for grating is given by: R = N/m R = m/N None of these R = N x m
20 To see the minor details of the object by microscope, it should have: High magnifying power High resolving power Am objective of larger focal length None of these
21 The focal length of convex lens having magnifying power of 5.55 is: 5.5 cm 5 cm 4.5 cm 6 cm
22 The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is: 1 0.2 2 0.1
23 A magnifier gives an image which is: Virtual, inverted Real, erect Virtual, erect Real, inverted
24 The magnifier forms a virtual image of the object at: None of these Both A and B are correct Much farther than the least distance Least distance of distinct vision
25 The magnifier forms a virtual image of the object at: None of these Least distance of distinct vision Much farther than the least distance Both A and B are correct
26 The size of the image is maximum when its distance from the magnifying glass is: 0.10 m 0.15 m 0.20 m 0.25 m
27 The ratio of the size of the image to that of object is called: Focal length Aperture Linear magnification Principal axis
28 If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object: Double the size Same size Half the size None of these
29 When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears: Greater, smaller Smaller, smaller Smaller, larger Greater, larger
30 A virtual image is formed when object is placed: Within focal length of a convex lens Near the focal point of a concave lens Both A and B Away from 2F of a convex lens
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