MDCAT Physics MCQ's Test With Answers

MDCAT Physics MCQ's Test

Sr. # Questions Answers Choice
1 The fractional change in volume per unit increase in pressure is called: Bulk modulus Compressibility Pressure coefficient Volume coefficient
2 If both the length and radius of the wire are doubled,how does the modulus of elasticity change? Becomes one fourth Halved Doubled Remains unchanged
3 Breaking load for units area of cross-section of a wire is called: Tensile strength Ductibility Yield point Breaking stress
4 A cable breaks if stretched by more than 2 mm.It is cut into two equal parts.How much either part can be stretched without breaking? 0.25 m 0.5 m 1 mm 2 mm
5 For obtaining appreciable extension,the wire should be: Short and thin Long and thin Short and tick Long and thick
6 According to the Hooke's law the force required to change the length of a wire by '1' is proportional to: 1<sup>-2</sup> 1<sup>-1</sup> 1
7 A wire is stretched to double of its length.The strain is 2 1 Zero 0.5
8 How does the Young's modulus vary with the increase of temperature? Decrease Increase Remains constant First increases and then decreases
9 The modulus of elasticity of a liquid is: Zero 1 Infinity A value not one of those mentioned above
10 Steel is preferred for making springs over copper.Whey? Steel is cheaper Young;s modulus of steel is more than that of copper Young's modulus of copper is more than that of steel Steel is less likely to be oxidized.
11 Which of the modulus of elasticity is involved in compressing a rod to decrease its length? Young's modulus Bulk modulus Modulus of rigidity None of the above
12 The dimensional formula for the modulus of elasticity is same as that for: Stress Strain Velocity Surface tension
13 The speed of light in vacuum is 3 x 108 ms-1.Its speed in a medium of refractive index 1.5 will be 6.5 x 10<sup>8</sup> 2 x 10<sup>8</sup> ms<sup>-1</sup> 4.5 x 10<sup>8</sup> cm 5.5 x 10<sup>8</sup>
14 The critical angle for a ray of light suffering total internal reflection will be smallest for the ray traveling from Water to glass Water to air Glass to air Glass to water
15 Just before  setting the sun may appear to be elliptical This happens due to Diffraction Reflection Dispersion Refraction
16 At what distance should a book be placed from a 50 Cd bulb so that the luminance on the book becomes 2 Im m-2 50 m 10 m 5 m 1 m
17 Inverse square law for luminance is valid for Search light Isotropic point source Cylindrical source All types of sources
18 If the distance of a surface from light source is doubled,then the luminance will become 1/4 times 1/2 times 2 times 4 times
19 A beam of light enters air from water.Which of the following characteristics of light will not change in water? Frequency Wavelength Velocity Amplitude
20 For obtaining equal and same height mirror should be Convex Concave Plane None
21 In a astronomical telescope the final image for normal vision is formed at The focal of the eye piece The least distance of the distinct vision The focus of the objective lens Infinity
22 If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope Decreases Increases Gets halved Remains unchanged
23 Near and far points of a healthy human eye respectively are 0 and 25 cm 0 and infinity 25 cm and 100 cm 25 cm and infinity &nbsp;
24 The resolving power of telescope depends on Focal length of eye lens Focal length of objective lens Length of the telescope Diameter of he objective lens
25 In a compound microscope the intermediate image is Virtual erect and magnified Real,erect and magnified Virtual,inverted and magnified Virtual,erect and reduced
26 Resolving power of a telescope depends on: The magnification of eyepiece The focal length of objective lens Diameter of objective lens Refractive index of objective lens
27 Geometrical optics cannot give following characteristics for a microscope Image position Image size Resolution of image Any of the above
28 While viewing a distant object with a telescope suddenly a housefly sits on objective lens.The correct statement is that Housefly will be seen enlarged in image Housefly will be seen reduced in image Intensity of image will be decreased Intensity of image will be increased
29 The astronomical telescope consists of objective and eye piece.The focal length of he objective is Equal to that of the eye piece Greater than that of eye piece Shorter than that of eye piece Five times shorter than that of the eye piece
30 For the normal setting of a telescope Only the object is at infinity Only the final image is at infinity Both the object and the final image is at infinity Neither the object nor the final image has to be at infinity
31 Which of the following is conserved when light waves interfere? Intensity Energy Amplitude Momentum
32 A convex lens has focal length F.An object is placed at P then Image is formed at +&nbsp;∞ and is real Image is formed at +&nbsp;∞ and is virtual Image is formed at +&nbsp;∞ and is real Image is formed at + and is virtual
33 Which part of the spectrum is most visible? Red Violet Yellow Yellow-green
34 Finger prints on paper are identified by sprinkling fluorescent powder on it and observing it under Sun light Sodium light Infrared UV
35 The image formed by an eyepiece of compound microscope is Real and diminished Real and enlarged Virtual and enlarged Virtual and diminished
36 To get three images of a single object,one should have two plane mirrors at an angle of 90° 120° 30° 160°
37 If red light is incident on sea water it appears Red Green Blue Yellow
38 Which of the following colors suffers maximum deviation in a prism? Yellow Blue Green Orange
39 A diffraction pattern is obtained using a beam of red light What will happen if the red light is replaced by blue light? No change Diffraction bands become narrower and crowded together Bands become broader and farther apart Bands disappear
40 Soap bubble looks colored due to Dispersion Reflection Interference Any one of these
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