1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Arrange the following in the increasing order of their covalent character.

$\mathrm{CaF}_2 ; \mathrm{CaCl}_2 ; \mathrm{CaBr}_2 ; \mathrm{CaI}_2$

A
$\mathrm{CaF}_2<\mathrm{CaI}_2<\mathrm{CaBr}_2<\mathrm{CaCl}_2$
B
$\mathrm{CaF}_2<\mathrm{CaCl}_2<\mathrm{CaI}_2<\mathrm{CaBr}_2$
C
$\mathrm{CaCl}_2<\mathrm{CaF}_2<\mathrm{CaBr}_2<\mathrm{CaI}_2$
D
$\mathrm{CaF}_2<\mathrm{CaCl}_2<\mathrm{CaBr}_2<\mathrm{CaI}_2$
2
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A function $f$ from the set of natural numbers to integers defined by

$$f(n)=\left\{\begin{array}{l} \frac{n-1}{2}, \quad \text { when } n \text { is odd } \\ -\frac{n}{2}, \quad \text { when } n \text { is even } \end{array} \quad\right. \text { is }$$

A
neither one-one nor onto
B
one-one but not onto
C
onto but not one-one
D
one-one and onto
3
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
The value of $\frac{\sin ^2 20^{\circ}+\cos ^4 20^{\circ}}{\sin ^4 20^{\circ}+\cos ^2 20^{\circ}}$ is :
A
0
B
2
C
1
D
$\frac{1}{2}$
4
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
$$\int \frac{\sin 2 x}{(1+\sin x)(2+\sin x)} d x=a \log |1+\sin x|-b \log |2+\sin x|+c$$ then the value of $a$ and $b$ is ----------------
A
$a=-2, b=4$
B
$a=2, b=4$
C
$a=-2, b=-4$
D
$a=2, b=-4$
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