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The percentage errors in the measurement of mass and momentum of an object are 1% and 2% respectively. The percentage error in the measurement of kinetic energy of the object will be:
When the circular scale of a screw gauge completes 2 rotations, it covers 1 mm over the pitch scale. The total number of circular scale divisions is 50. The least count of the screw gauge in metres is:
A metal wire has mass $(0.4\pm 0.002)\text{ g}$, radius $(0.3\pm 0.001)\text{ mm}$ and length $(5\pm 0.02)\text{ cm}$. The maximum possible percentage error in the measurement of density will nearly be:
If $E$ and $G$ respectively denote energy and gravitational constant, then $\frac{E}{G}$ has the dimensions of:
The radius of a hydrogen shell is 0.53 Å. In its first excited state, radius of the shell will be:
For a p-type semiconductor, which of the following statements is true ?
The unit of thermal conductivity is :
Which one is the wrong statement?
The magnetic moment of 2.84 BM can be shown by: (At. no. Ni = 28, Ti = 22, Cr = 24, Co = 27)
Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?
Maximum number of electrons in a subshell of an atom can be determined by which of the following formula:
If uncertainty in position and momentum are both equal, what will the uncertainty in velocity be?
Given the following data: Mass of electron: 9.11 × 10⁻³¹ kg Planck's constant: 6.626 × 10⁻³⁴ Js In light of the data given above, the uncertainty involved in the measurement of velocity within a distance of 0.1 Å will be:
The number of d-electrons in Fe²⁺ (atomic number Z = 26) is not equal to the number of:
Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in the presence of calcium oxide is:
The incorrect statement among the following is:
The value of Planck's constant is 6.63 × 10⁻³⁴ Js. The speed of light is 3 × 10¹⁷ nm s⁻¹. Which value is closest to the wavelength in nanometers of a quantum of light with a frequency of 6 × 10¹⁵ s⁻¹?
Experimental verification of the chromosomal theory of inheritance was done by
A block of mass $m$ is moving with initial velocity $u$ towards a stationary spring of stiffness constant $k$ attached to the wall as shown in the figure. Maximum compression of the spring is: (The friction between the block and the surface is negligible).
Let $T_1$ and $T_2$ be the energy of an electron in the first and second excited states of hydrogen atoms, respectively. According to the Bohr's model of an atom, the ratio $T_1 : T_2$ is