Maths-
General
Easy
Question
If |sinx + cosx| = |sinx| + |cosx|, then x belongs to the quadrant
- I or III
- II or IV
- I or II
- III or IV
The correct answer is: I or III
Given |sin x + cos x| = |sin x| + |cos x| Then sin x and cos x both will be positive or negative. Hence, x belongs to I quadrant or III quadrant
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Cadmium rods are used in a nuclear reactor for
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To determine the half- life of radioactive element, a student plots graph of ln
t. Here 
is the rate of radioactive decay at time t. If the number of radioactive nuclei of this element decreases by a factor of 
after 4.16 yr, the value of is
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In Bohr model of hydrogen atom, the force on the electron depends on the principal quantum number as
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Assertion : All the radioactive elements are ultimately converted in lead.
Reason : All the elements above lead are unstable.
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Reason : All the elements above lead are unstable.
Physics-General
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The figure shows a graph between 
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The graph which represents the correct variation of logarithm of activity (log A) versus time, in figure is
The graph which represents the correct variation of logarithm of activity (log A) versus time, in figure is
Physics-General
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In Fig. X represents time and Y represent activity of a radioactive sample. Then the activity of sample, varies with time according to the curve
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Binding energy per nucleon verses mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei indicated on the curve. The process that would release energy is
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Physics-General
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The fraction f of radioactive material that has decayed in time t, varies with time t. The correct variation is given by the curve
The fraction f of radioactive material that has decayed in time t, varies with time t. The correct variation is given by the curve
Physics-General
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The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half life of material and the total counts (approximately) in the first half life period, respectively are
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Physics-General
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Binding energy per nucleon plot against the mass number for stable nuclei is shown in the figure. Which curve is correct
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The graph between wave number 
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