Question : Which river basin is shared by more than 10 states of India?

Option 1: Indus

Option 2: Brahmaputra

Option 3: Ganga

Option 4: Damodar

Question : The difference between the largest and the smallest angles of a triangle whose angles are in the ratio of 5 : 3 : 10 is:

Option 1: 20°

Option 2: 30°

Option 3: 50°

Option 4: 70°

Question : The value of $\operatorname{cosec}^{2}60°+\sec^{2}60°– \cot^{2}60°+\tan^{2}30°$ will be:

Option 1: $5$

Option 2: $5\frac{1}{2}$

Option 3: $5\frac{1}{3}$

Option 4: $5\frac{2}{3}$

Question : If $\sec( 4x-50°)=\operatorname{cosec}( 50°-x)$, then the value of $x$ is:

Option 1: 45°

Option 2: 90°

Option 3: 30°

Option 4: 60°

Question : If $\cos (A-B)=\frac{\sqrt{3}}{2}$, and $\cos (A+B)=0$, where $A$ and $B$ are positive acute angles and $A \geq B$, then the measures of $A$ and $B$ are:

Option 1: 80° and 10°

Option 2: 60° and 30°

Option 3: 70° and 20°

Option 4: 50° and 40°