Archives

The atomic hydrogen emits a line spectrum consisting of various series. Which series of hydrogen atomic spectra lie in the visible region?

a. Balmer series b. Lyman series c. Brackett series d. Paschen series Answer: (a) Balmer series of hydrogen atomic spectrum is lying in the... View Article

Two identical photocathodes receive the light of frequencies f₁ and f₂ respectively.

Two identical photocathodes receive the light of frequencies f1 and f2 respectively. If the velocities of the photo-electrons coming out are v1... View Article

An object is located 2 km beneath the surface of the water.

An object is located 2 km beneath the surface of the water. If the fractional compression ∆V/V is 1.36%, the ratio of hydraulic stress to the... View Article

A block of mass 1 kg attached to a spring is made to oscillate with an initial amplitude of 12 cm.

A block of mass 1 kg attached to a spring is made to oscillate with an initial amplitude of 12 cm. After 2 minutes the amplitude decreases to 6... View Article

The velocity of a particle is v=v₀+gt+Ft².

The velocity of a particle is v=v0+gt+Ft2. Its position is x=0 at t=0; then its displacement after time (t = 1) is : a. v0+g/2+F b. v0+2g+3F... View Article

A geostationary satellite is orbiting around an arbitrary planet ‘P’ at a height of 11R above the surface of ‘P’, R being the radius of ‘P’.

A geostationary satellite is orbiting around an arbitrary planet ‘P’ at a height of 11R above the surface of ‘P’, R being... View Article

Match List I with List II

Match List I with List II List I List II a) Phase difference between current and voltage in a purely resistive AC circuit i. 𝜋/2,... View Article

Two particles A and B of equal masses are suspended from two massless springs of spring constants K₁ and K₂ respectively.

Two particles A and B of equal masses are suspended from two massless springs of spring constants K1 and K2 respectively. If the maximum... View Article

A carrier signal C(t) = 25 sin (2.512×10¹⁰t) is amplitude modulated by a message signal

A carrier signal C(t) = 25 sin (2.512×1010t) is amplitude modulated by a message signal m(t)= 5 sin (1.57×108t) and transmitted... View Article

A sound wave of frequency 245 Hz travels with a speed of 300 ms^-1along the positive x-axis.

A sound wave of frequency 245 Hz travels with a speed of 300 ms-1 along the positive x-axis. Each point of the medium moves to and fro through a... View Article

Two cells of emf 2E and E with internal resistance r₁ and r₂respectively are connected in series to an external resistor R

Two cells of emf 2E and E with internal resistance r1 and r2 respectively are connected in series to an external resistor R (see figure). The... View Article

If one mole of a polyatomic gas has two vibrational modes and β is the ratio of molar specific heats for polyatomic gas β=C_p / C_v then the value of β is

a. 1.35 b. 1.02 c. 1.25 d. 1.2 Answer: (d) Degree of freedom of polyatomic gas Here, no of translational dof = 3, no of rotational dof = 3... View Article

A solid sphere of mass 2 kg radius 0.5m is rolling

A solid sphere of mass 2 kg radius 0.5m is rolling with an initial speed of 1 ms-1 goes up an inclined plane which makes an angle of 300 with the... View Article

Two identical blocks A and B each of mass m resting on the smooth horizontal floor

Two identical blocks A and B each of mass m resting on the smooth horizontal floor are connected by a light spring of natural length L and spring... View Article

Answer the following by appropriately matching the lists based on the information given in the paragraph.

Answer the following by appropriately matching the lists based on the information given in the paragraph. Let the circles C1 : x2 + y2 = 9 and C2... View Article

Let [latex]\vec a = 2 \hat i + \hat j – \hat k \ and \ \vec b = \hat i + 2 \hat j + \hat k[/latex] be two vectors.

Let equals Solution: Hence the minimum value is 18.... View Article

The value of the integral [latex]int_0^{frac{pi}{2}} frac{3 sqrt{cos theta}}{(sqrt{cos theta} + sqrt{sin theta})^5} d theta[/latex] equals

The value of the integral equals Solution: Let tan θ = t2 =>sec 2θ dθ = dt 2I/3 = Hint: Split 2t/((t+1)4 =... View Article

M	T	W	T	F	S	S
			1	2	3	4
5	6	7	8	9	10	11
12	13	14	15	16	17	18
19	20	21	22	23	24	25
26	27	28	29	30	31