17. Radioactivity is a ______ (A) Spontaneous activity (B) Chemical property_____________?
A & B
B & C
C & A
A B & C
18. The ration stress to strain in youngs modulus of the material then tension is__________________?
Directly proportional to extension
Directly proportional to strain
Directly proportional to square of amplitude
Inversely proportional to extension
Answer & Solution
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19. The distance covered by a body in time t starting from rest is__________________?
at2/2
Vt
a2t/2
at2
20. In a semiconductors the charge carriers are ___________________?
Holes only
Electrons only
Electron and holes both
All of the above
Answer & Solution
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21. Forward current through a semi conductor diode circuit is due to____________?
minority carriers
majority carriers
holes
electron
Answer & Solution
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22. The diameter of an atom is approximately_______________?
10-12m
10-11m
10-10m
10-14m
23. Irregular flow of fluid is called_______________?
Streamline
Turbulent
Uniform
Laminar
Answer & Solution
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24. Stokes law is applicable if body has __________shape?
Rough
Square
Circular
Spherical
Answer & Solution
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25. The acceleration of a projection on the diameter for a particle moving along a circle is_______________?
w2x
wx2
w2x
wx2
26. 2nd law of motion gives the definition of________________?
force
acceleration
velocity
both force and acceleration
Answer & Solution
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27. The critical speed of an artificial satellite is_______________?
8 Kms-1
8.1 Kms-1
7.9 Kms-1
8 ms-1
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28. As the temperature of black body is raised the wavelength corresponding to maximum intensity________________?
shifts towards longer wavelength
shifts towards shorter wavelength
remain the same
shifts towards longer as well as shorter wavelengths
Answer & Solution
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29. When a force is parallel to the direction of motion of the body, then work done on the body is_____________________?
zero
minimum
infinity
maximum
30. Inertia of an object is quantitative measure of its__________________?
volume
density
mass
temperature