Commerce (English Medium) Class 12 - CBSE Question Bank Solutions

The height of a cylinder is equal to the radius. If an error of α % is made in the height, then percentage error in its volume is

While measuring the side of an equilateral triangle an error of k % is made, the percentage error in its area is

If log_e 4 = 1.3868, then log_e 4.01 =

A sphere of radius 100 mm shrinks to radius 98 mm, then the approximate decrease in its volume is

If the ratio of base radius and height of a cone is 1 : 2 and percentage error in radius is λ %, then the error in its volume is

The pressure P and volume V of a gas are connected by the relation PV^1/4 = constant. The percentage increase in the pressure corresponding to a deminition of 1/2 % in the volume is

If y = xⁿ  then the ratio of relative errors in y and x is

The approximate value of (33)^1/5 is

The circumference of a circle is measured as 28 cm with an error of 0.01 cm. The percentage error in the area is

The equation of the curve satisfying the differential equation y (x + y³) dx = x (y³ − x) dy and passing through the point (1, 1) is

Find the equation of the plane passing through the following points.

 (2, 1, 0), (3, −2, −2) and (3, 1, 7)

Find the equation of the plane passing through the following points.

 (−5, 0, −6), (−3, 10, −9) and (−2, 6, −6)

Find the equation of the plane passing through the following point

 (1, 1, 1), (1, −1, 2) and (−2, −2, 2)

Find the equation of the plane passing through the following points. 

(2, 3, 4), (−3, 5, 1) and (4, −1, 2) 

Find the equation of the plane passing through the following point

(0, −1, 0), (3, 3, 0) and (1, 1, 1)

Show that the four points (0, −1, −1), (4, 5, 1), (3, 9, 4) and (−4, 4, 4) are coplanar and find the equation of the common plane.

Show that the following points are coplanar.
 (0, −1, 0), (2, 1, −1), (1, 1, 1) and (3, 3, 0) 

Show that the following points are coplanar. 

Find the coordinates of the point P where the line through A (3, -4 , -5 ) and B (2, -3 , 1) crosses the plane passing through three points L(2,2,1), M(3,0,1) and N(4, -1,0 ) . Also, find the ratio in which P diveides the line segment AB.

Find the vector equations of the following planes in scalar product form  \[\left( \vec{r} \cdot \vec{n} = d \right):\] \[\vec{r} = \left( 2 \hat{i} - \hat{k} \right) + \lambda \hat{i} + \mu\left( \hat{i} - 2 \hat{j} - \hat{k}
\right)\]