Choose incorrect sentence.
Choose incorrect sentence.
- A
$UV$ radiation of wavelengths shorter than $UV-B$, are almost completely absorbed byearth's atmosphere.
- B
$UV-B$ damages $DNA$ and mutation may occur.
- C
'Bad' ozone, formed in the lower atmosphere (troposphere) that harms plants and animals.
- D
'Good' ozone formed in the troposphere and it acts as a shield absorbing $UV$ radiation from the sun.
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$A$ body of mass $5\, kg$ moving with a velocity $10\, m/s$ collides with another body of mass $20\, kg$ at rest and comes to rest. The velocity of the second body after the collision is ......... $m/s$.
If both the mass and the radius of the earth decrease by $1\%$,the value of the acceleration due to gravity will
If a $p-n$ junction is forward biased,then which of the following figures gives the correct direction of current inside the semiconductor?
If $f(x) = x^5 - 5x^4 + 5x^3 - 10$ has local maximum and minimum at $x = p$ and $x = q$,respectively,then $(p, q)$ equals
The following are some statements related to $VA$ group hydrides:
$I$. Reducing property increases from $NH_3$ to $BiH_3$.
$II$. Tendency to donate lone pair decreases from $NH_3$ to $BiH_3$.
$III$. Thermal stability of hydrides decreases from $NH_3$ to $BiH_3$.
$IV$. Bond angle of hydrides decreases from $NH_3$ to $BiH_3$.
The correct statements are:
$I$. Reducing property increases from $NH_3$ to $BiH_3$.
$II$. Tendency to donate lone pair decreases from $NH_3$ to $BiH_3$.
$III$. Thermal stability of hydrides decreases from $NH_3$ to $BiH_3$.
$IV$. Bond angle of hydrides decreases from $NH_3$ to $BiH_3$.
The correct statements are:
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