Question : Mycobacterium laprae is a

Option 1: Bacillus

Option 2: Coccus

Option 3: Spiral

Option 4: Spore

Question : $\cos^4 A-\sin^4 A$ is equal to:

Option 1: $2 \cos^2 A+1$

Option 2: $1-2 \sin ^2 A$

Option 3: $2 \sin^2 A-1$

Option 4: $-\left(2 \sin^2 A+1\right)$

Question : If $\sin A+\sin ^2 A=1$, then the value of the expression $\left(\cos ^2 A+\cos ^4 A\right)$ is

Option 1: $\frac{3}{2}$

Option 2: $1$

Option 3: $2$

Option 4: $\frac{1}{2}$

Question : The given expression is equal to $\frac{\sin^4 A+\cos^4 A}{1-2 \sin^2 A \cos^2 A}$:

Option 1: 1

Option 2: –1

Option 3: 0

Option 4: 2

Question : If $ a^{2}+a+1=0$, then the value of $a^{5}+a^{4}+1$ is:

Option 1: $a^2$

Option 2: $1$

Option 3: $0$

Option 4: $a+1$

Question : If $4 \sin ^2 \mathrm{A}-3=0$ and $0 \leq \mathrm{A} \leq 90^{\circ}$, then $3 \sin \mathrm{A}-4 \sin ^3 \mathrm{A}$ is:

Option 1: $\frac{1}{2}$

Option 2: $\sqrt{\frac{3}{2}}$

Option 3: $0$

Option 4: $1$