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Important notice cbse practical exam

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Q.27. According to a psychologist, the ability of a person to understand spatial concepts is given

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Q.26. A kite is flying at a height of 3 metres and 5 metres of string is out. If the kite is moving

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Q.25. The two co-initial adjacent sides of a parallelogram are 2ı̂− 4ȷ̂− 5k̂ and 2ı̂ + 2ȷ̂+ 3k̂

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Q.24. (a) If vectors 𝑎⃗ = 2ı̂ + 2ȷ̂+ 3k̂ , 𝑏⃗⃗ = − ı̂ + 2ȷ̂+ k̂ and 𝑐⃗ = 3ı̂+ ȷ̂are such that

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Q.24. (b) A person standing at O (000 , , ) is watching an aeroplane which is at the coordinat

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Q.23. (b) Differentiate the following function with respect to x : (𝑐𝑜𝑠 𝑥) 𝑥 ; (where𝑥 ∈ (0, 𝜋 2 )).

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Q.23. (a) Find the derivative of 1 tan− x with respect to log ; x (where x   (1, ) ).

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Q.22. The cost (in rupees) of producing x items in factory, each day is given by 𝐶(𝑥) = 0.00013𝑥 3

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Q.21. If 𝑐𝑜𝑡−1 (3𝑥 + 5) 𝜋 4 , then find the range of the values of x.

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Q.20. Assertion (A): The function 𝑓: 𝑅 − {(2𝑛 + 1) 𝜋 2 : 𝑛 ∈ 𝑍 } → (−∞, −1] ∪ [1, ∞) defined by f

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Q.19. Assertion (A): Consider the function defined as 𝑓(𝑥) = |𝑥| + |𝑥 − 1|, 𝑥 ∈ 𝑅. Then f x( ) is

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Q.18. A student observes an open-air Honeybee nest on the branch of a tree, whose plane figure is pa

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Q.17. The function 𝑓: 𝑅 → 𝑍 defined by f x x ( ) =  ; where  . denotes the greatest integ

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Q.16. A linear programming problem (LPP) along with the graph of its constraints is shown below.

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Q.15. The graph drawn below depicts (A) y = 𝑠𝑖𝑛−1 𝑥 (B) y = 𝑐𝑜𝑠−1 𝑥 (C) y = 𝑐𝑜𝑠 𝑒 𝑐 −1𝑥 (D) y

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Q.14. What is the general solution of the differential equation e y ′ = x? (A)𝑦 = 𝑥𝑙𝑜𝑔𝑥 + 𝑐 (

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Q.13. ∫ 𝒄𝒐𝒔𝒆𝒄𝟕𝒙 𝟐𝝅 𝟎 𝒅𝒙 = (A) 0 (B) 1 (C) 4 (D) 2

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Q.12. ∫ 𝒅𝒙 𝒙 𝟑(𝟏+𝒙 𝟒) 𝟏 𝟐 equals (A) − 1 2𝑥 2 √1 + 𝑥 4 + 𝑐 (B) 1 2𝑥 √1 + 𝑥 4 + 𝑐 (C) − 1 4𝑥 √1

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Q.11. For the linear programming problem (LPP), the objective function is Z x y = + 4 3 Z=4+3y

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Q.10. If |𝑎⃗| = 3, |𝑏⃗⃗| = 4 and |𝑎⃗ + 𝑏⃗⃗| =5, then |𝑎⃗ − 𝑏⃗⃗| = (A) 3 (B) 4 (C) 5 (D) 8

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Q.9. The value of 𝛼 if the angle between 𝑝⃗ = 2𝛼 2 𝑖̂− 3𝛼𝑗̂+ 𝑘̂ and 𝑞⃗ = 𝑖̂+ 𝑗̂+ 𝛼𝑘̂ is obtuse, is

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Q.8. For any two events A and B , if P(A- )=1/ 2 P A = , ( ) 2 3 P B = and ( ) 1 , 4 P A = B t

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Q.7. If 0 1 1 2 3 0 c A a b     = − −       is a skew-symmetric matrix then the val