Vakya banane ka Saral tarika

Let vec A be a vector parallel to the line of intersection of planes P_1a n dP_2dot Plane P_1 is parallel to vectors 2 hat j+3 hat ka n d4 hat j-3ka n dP_2 is parallel to hat j- hat ka n d3 hat i+3 hat jdot Then the angle betweenvector vec A and a given vector 2 hat i+ hat j-2 hat k is a. pi//2 b. pi//4 c. pi//6 d. 3pi//4

If S=[S_(i j)] is a scalar matrix such that s_(i i)=ka n dA is a square matrix of the same order, then A S=S A=? A^k (b) k+A (c) k A (d) k S

Let A be a square matrix of order 3 times 3 , then abs(kA) is equal to

If A=[a_(ij)] is a scalar matrix of order nxxn and k is a scalar, then abs(kA)=

A force F=-k(^hati + x^hatj) (where k is a positive constant) acts on a particle moving in the x-y plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a,0) and then parallel to the y-axis to the point (a,a) . The total work done by the force F on the particle is (a) -2ka^(2) , (b) 2ka^(2) , (c) -ka^(2) , (d) ka^(2)

Tanvi bought ten food items from the supermarket, which are wheat, banans, mushrooms, onions, Porphyra (Laver), Kelps, pine seeds, Sphagnum moss, lady's fingers and potatoes. Based on hierarchial classification, how many different phyla/divisions do these items belong to ?

For two weak acids A and B, the ratio of their percent ionization is 4 : 9. The ratio of their Ka would be–

If A and B are square matrices of the same order, then (i) (AB)=......... (ii) (KA)=.......... (where, k is any scalar) (iii) [k(A-B)]=......

Dissociation constant (K_a) of formic acid and acetic acid are 2.5xx10^-4 and 0.5xx10^-5 respectively. The ratio of their relative strengths at the same concentration is

Two satellites , A and B , have masses m and 2m respectively . A is in a circular orbit of radius R , and B is in a circular orbit of radius 2R around the earth . The ratio of their energies , K_A/K_B is :