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26. The surface areas of the six faces of a rectangular solid are 16, 16, 32, 32, 72 and 72 square centimetres. The volume of the solid, in cubic centimetres, is 16 … 26. The surface areas of the six faces of a rectangular solid are 16 3^2 72 and 72 square centimetres. The volume [...]

19. The reciprocal of any rational number p/q , where p and q are integers and q ≠ 0, is 19. The reciprocal of any rational number p/q is where p and q are integers and q ≠ 0. July 7, 2021 Category: Chapter 1 - Rational Numbers , Maths , NCERT Class 8 ,

27. In a medical examination of students of a class, the following blood groups are recorded: A student is selected at random from the class. The probability that he/she has blood group B, is : 27. In a medical examination of students of a class is the following blood groups are recorded: A student is [...]

8. The area of an isosceles triangle having base 2 cm and the length of one of the equal sides 4 cm, is 8. The area of an isosceles triangle having base 2 cm and the length of one of the equal sides 4 cm is July 2, 2021 Category: Chapter 12 - Heron's Formula [...]

9. The figure obtained by joining the mid-points of the sides of a rhombus, taken in order, is 9. The figure obtained by joining the mid-points of the sides of a rhombus is taken in order June 30, 2021 Category: Chapter 8 - Quadrilaterals , Maths , NCERT Class 9 ,

The ratio of intensities between two coherent sound sources is 4 : 1. The difference of loudness in decibels between maximum and minimum intensities, when they interfere in space, is is The ratio of intensities between two coherent sound sources is 4 : 1. The difference of loudness in decibels between maximum and minimum intensities [...]

The energy of an electron in excited hydrogen atom is -3.4 eV. Then, according to Bohr’s theory, the angular momentum of the electron of the electron, in J s, is According to Bohr's theory in J s is the angular momentum of the electron of the electron The energy of an electron in excited hydrogen [...]

The rate constant for the first order reaction whose half life is 480 sec, is : is The rate constant for the first order reaction whose half life is 480 sec June 3, 2021 Category: Chapter 7 - Chemical Kinetics and Nuclear Chemistry (Level 1 and Level 2) , N Awasthi Physical Chemistry ,

The differential rate law equation for the elementary reaction A+2Bk→3C, is. is The differential rate law equation for the elementary reaction A+2Bk→3C June 2, 2021 Category: Chapter 7 - Chemical Kinetics and Nuclear Chemistry (Level 1 and Level 2) , N Awasthi Physical Chemistry ,

In an experiment the initial number of radioactive nuclei is 3000. It is found that 1000±40 nuclei decayed in the 1.0 s. For ∣x∣<<1, in (1+x)=x up to first power in x. The error Δλ, in the determination of the decay constant λ, is s −1 , is in (1+x)=x up to first power in [...]