Answers for MCQ CBSE 12 Science Maths Three Dimensional Geometry in English to enable students to get Answers in a narrative video format for the specific question.

Expert Teacher provides Answers for MCQ CBSE 12 Science Maths Three Dimensional Geometry through Video Answers in English language. This video solution will be useful for students to understand how to write an answer in exam in order to score more marks. This teacher uses a narrative style for a question from Three Dimensional Geometry not only to explain the proper method of answering question, but deriving right answer too.

Please find the question below and view the Answer in a narrative video format.

** Question:**

** Answer Video in** **English****:**

**Question 1** : Find the equation of the plane passing through the line of intersection of the planes x + y + z = 1 and 2x + 3y + 4z = 5 which is perpendicular to the plane x - y + z = 0. Also, find the distance of the plane obtained above from the origin. (View Answer Video)

**Question 2** : If a line makes angleandwith the coordinate axis, then find the value of (View Answer Video)

**Question 3** : Find the distance of the point (-1, -5, -10) from the point of intersection of the line and plane (View Answer Video)

**Question 4** : Find the distance between the point (5, 4, -6) and its image in xy-plane. (View Answer Video)

**Question 5** : The equation of a line AB is Write the direction cosines of a line parallel to the above line. (View Answer Video)

**Question 1** : A tank with a rectangular base and rectangular sides, open at the top is to be constructed so that its depth is 2m and volume is If the building of tank costs Rs.70 per sq meter for the base and Rs.45 per sq meter for sides. What is the cost of least expensive? (View Answer Video)

**Question 2** : Find two positive numbers whose sum is 16 and the sum of whose cubes is minimum. (View Answer Video)

**Question 3** : The normal at the point (1, 1) on the curve is: (View Answer Video)

**Question 4** : The slope of the normal to the curve at x = 0 is: (View Answer Video)

**Question 5** : Equation of normal to the curve x+y=x^y where it cuts x-axis; is (View Answer Video)

**Question 1** : If P(F) = 0.35 and =0.85 and E and F are independent events. Find P(E). (View Answer Video)

**Question 2** : There are three coins. One is a two-headed coin (having head on both faces), another is a biased coin that comes up heads 75% of the times and third is also a biased coin that comes up tails 40% of the times. One of the three coins is chosen at random and tossed, and it shows heads. What is the probability that it was the two-headed coin? (View Answer Video)

**Question 3** : A couple has 2 children. Find the probability that both are boys, if it is known that the older child is boy. (View Answer Video)

**Question 4** : Of the students in a college, it is known that 60% reside in hostel and 40% are day scholars (not residing in hostel). Previous year results report that 30% of all students who reside in hostel attain 'A' grade and 20% of day scholars attain 'A' grade in their annual examination. At the end of the year, one student is chosen at random from the college and he has an 'A' grade. What is the probability that the student is a hosteler? (View Answer Video)

**Question 5** : Three cards are drawn without replacement from a pack of 52 cards. Find the probability that the cards drawn are king, queen and jack.

(View Answer Video)

**Question 1** : Find the adjoint of the matrix . (View Answer Video)

**Question 2** : Find the equation of the line joining (3, 1) and (9, 3) using determinants. (View Answer Video)

**Question 3** : Using the properties of determinants, evaluate . (View Answer Video)

**Question 4** : Evaluate . (View Answer Video)

**Question 5** : Transpose of a rectangular matrix is a, (View Answer Video)