Recent questions tagged jeemain

A wire of length 'l' is bent into a circular loop of radius R and carries a current I. The magnetic field at the center of the loop is 'B'. The same wire is now bent into a double loop of equal radii. If both loops carry the same current I and it is in the same direction, the magnetic field at the center of the double loop will be :

asked Oct 14, 2013 by meena.p

1 answer

If $\sin\alpha+\sin\beta=\alpha$ and $\cos\alpha+\cos\beta=b$ then $\sin(\alpha+\beta)$ is equal to

asked Oct 14, 2013 by sreemathi.v

1 answer

If $\tan\alpha=\large\frac{1}{\sqrt{x(x^2+x+1)}}$,$\tan\beta=\large\frac{\sqrt x}{\sqrt{x^2+x+1}}$ and $\tan\gamma=\sqrt{x^{-3}+x^{-2}+x^{-1}}$ then $\alpha+\beta$ is

asked Oct 14, 2013 by sreemathi.v

1 answer

The coeff. of $x^n$ in the expansion of $(1+x)(1-x)^n$ is ?

asked Oct 14, 2013 by rvidyagovindarajan_1

1 answer

If $\tan A-\tan B=x$ and $\cot B-\cot A=y$ then $\cot(A-B)$ is equal to

asked Oct 14, 2013 by sreemathi.v

1 answer

$^nC_0^2$ + $^nC_1^2$ + $^nC_2^2$ + ...... + $^nC_n^2$ = ?

asked Oct 14, 2013 by rvidyagovindarajan_1

1 answer

The value of $\sqrt{\large\frac{1+\cos\theta}{1-\cos\theta}}$ is equal to

asked Oct 14, 2013 by sreemathi.v

1 answer

The value of $\sqrt{\large\frac{1-\sin\theta}{1+\sin\theta}}$ is equal to

asked Oct 14, 2013 by sreemathi.v

1 answer

The following series $L-C-R$ circuit, when driven by an e.m.f source of angular frequency 70 Kilo-radius per second, the circuit effectively behaves like :

asked Oct 14, 2013 by meena.p

1 answer

If $\alpha+\beta=\large\frac{\pi}{2}$ and $\beta+\gamma=\alpha$ then $\tan \alpha$ equals

asked Oct 14, 2013 by sreemathi.v

1 answer

A cell in secondary circuit gives null deflection for $2.5\;m$ length of potentiometer having 10 m length of wire. If the length of the potentiometer wire is increased by 1 m without changing the cell in the primary, the position of the null point now is :

asked Oct 14, 2013 by meena.p

1 answer

In the circuit shown below, a voltmeter of internal resistance R, When connected across B and C reads $\large\frac{100}{3}$ volts. Neglecting the internal resistance of the battery, the value of R is :

asked Oct 14, 2013 by meena.p

1 answer

The number of distinct real roots of $\begin{vmatrix}\sin x&\cos x&\cos x\\\cos x&\sin x&\cos x\\ \cos x&\cos x&\sin x\end{vmatrix}=0$ in the interval $-\large\frac{\pi}{4}$$\leq x\leq \large\frac{\pi}{4}$ is

asked Oct 14, 2013 by sreemathi.v

1 answer

Two point charges $-q$ and $+q$ are located at points $(0,0,-a)$ and $(0,0,a)$ respectively.The electric potential at a point $(0,0,z)$ where $ z > a$ is :

asked Oct 14, 2013 by meena.p

1 answer

An infinitely long thin straight wire has uniform linear charge density of $ \large\frac{1}{3}\;$$ coul.m^{-1}. $ Then the magnitude of the electric intensity at a point 18 cm away is : (given $\in _{0}=8.8 \times 10^{-12} C^2 /N-m^2)$

asked Oct 14, 2013 by meena.p

1 answer

If $\large\frac{\sin^4x}{2}+\frac{\cos^4x}{3}=\frac{1}{5}$ then

asked Oct 14, 2013 by sreemathi.v

1 answer

The sides of a triangle inscribed in a given circle .Subtend angles of $\alpha,\beta$ and $\gamma$ at the centre.The minimum value of the arithemetic mean of $\cos(\alpha+\pi/2),\cos(\beta+\pi/2)$ and $\cos(\gamma+\pi/2)$ is equal to

asked Oct 14, 2013 by sreemathi.v

1 answer

Carbon and Hydrogen in an organic compound are detected as

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Which one of the following causes cancer?

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Which one of the following ischloropicrin?

asked Oct 13, 2013 by thanvigandhi_1

0 answers

The pair of chemicals used as food for yeast in the fermentation of molasses is :

asked Oct 13, 2013 by thanvigandhi_1

1 answer

The order of basic strength of $C_6H_5NH_2$ (1), $C_2H_5NH_2$ (2), $(C_2H_5)_2NH $ (3) and $NH_3$ (4) is :

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Identify the pair of condensation polymers from the following :

asked Oct 13, 2013 by thanvigandhi_1

1 answer

Which one of the following statements is correct?

asked Oct 13, 2013 by thanvigandhi_1

1 answer

The emf of a cell E is 15 V as shown in the figure with an internal resistance of $ 0.5 \Omega $. Then the value of the current drawn from the cell is

asked Oct 13, 2013 by thanvigandhi_1

1 answer