Related Questions

β-rays emission in radioactive disintegration is always accompanied by the emission of
A γ-rays
B α-rays
C Neutrons
D None of these
Two forces of magnitude 3m and 2m respectively have a resultant R. if the first force is doubled, the magnitude of the resultant is doubled.Find the angle betuween forces?
A 90°
B 120°
C 135°
D 145°
The energy required to be applied to a radioactive nucleus for the emission of a neutron is
A 1 MeV
B 2.4 MeV
C 4.3 MeV
D 7.8 MeV
Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.
A 0.8
B 7.8
C 200
D 10000
3N ও 2N মানের দুইটি বলের লদ্ধি R । প্রথম বলের মান দ্বিগুণ করলে লদ্ধির মানও দ্বিগুণ হয়। বলদ্বয়ের মধ্যবর্তী কোণের মান হবে- (The resultant of two forces 3N and 2N is R. If the first force is doubled then the resultant is also doubled. The angle between the forces is-)
A 30°
B 45°
C 65°
D 120°
The resultant of two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then,
A P = R
B Q = R
C P = Q
D None of the above is correct
The resultant of the two forces ‘P’ and ‘Q’ is ‘R’. If ‘Q’ is doubled, the new resultant is perpendicular to ‘P’. Then
A P = Q
B Q = R
C Q = 2R
D None of these
The resultant of the two forces P & Q is R. If Q is doubled, the new resultant is perpendicular to P. Then
A P = Q
B Q = R
C Q = 2R
D Q = 3R
To have pressure wholly compressive under the base of a retaining wall of width b, the resultant of the weight of the wall and the pressure exerted by the retained, earth should have eccentricity not more than
A $$\frac{{\text{b}}}{3}$$
B $$\frac{{\text{b}}}{4}$$
C $$\frac{{\text{b}}}{5}$$
D $$\frac{{\text{b}}}{6}$$
Their cells have a very well defined nucleus ,in which nuclear material (chromosomes or DNA) is enclosed in double nuclear membrane.
A Prokaryotes
B Bacterial
C Viral
D Eukaryotes

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