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Question Number 16156 Answers: 0 Comments: 2

A body in a uniform horizontal circular motion possesses a variable velocity. Does it mean that the K.E. of the body is also variable?

$A body in a uniform horizontal$ $circular motion possesses a variable$ $velocity . Does it mean that the K . E .$ $of the body is also variable ?$

Question Number 16155 Answers: 1 Comments: 0

A body of mass m is projected with a speed v making an angle θ with the vertical. What is the change in momentum of the body along the Y- axis; between the starting point and the highest point of its path?

$A body of mass m is projected with a$ $speed v making an angle θ with the$ $vertical . What is the change in$ $momentum of the body along the Y -$ $axis; between the starting point and the$ $highest point of its path ?$

Question Number 16152 Answers: 1 Comments: 0

In long jump, does it matter how high you jump? What factors determine the span of the jump?

$In long jump, does it matter how high$ $you jump ? What factors determine the$ $span of the jump ?$

Question Number 16150 Answers: 1 Comments: 1

A projectile is fired at an angle θ with the horizontal direction from O. Neglecting the air friction, it hits the ground at B after 3 seconds. What is the height of point A from ground? [Use g = 10 m/s^2 ]

$A projectile is fired at an angle θ with$ $the horizontal direction from O .$ $Neglecting the air friction, it hits the$ $ground at B after 3 seconds . What is$ $the height of point A from ground ?$ $[Use g = 10 m / s^{2}]$

Question Number 16139 Answers: 2 Comments: 0

Path of the bomb released from an aeroplane moving with uniform velocity at certain height as observed by the pilot is (a) a straight line (b) a parabola (c) a circle (d) none of the above

$Path of the bomb released from an$ $aeroplane moving with uniform$ $velocity at certain height as observed$ $by the pilot is$ $(a) a straight line$ $(b) a parabola$ $(c) a circle$ $(d) none of the above$

Question Number 16138 Answers: 0 Comments: 0

How many nodal planes are present in 4d_z^2 ?

$How many nodal planes are present in$ ${4 d}_{z^{2}} ?$

Question Number 16137 Answers: 0 Comments: 0

For 2s orbital Ψ_r = (1/(√8))((z/a_0 ))^(3/2) (2 − ((zr)/a_0 ))e^(−((zr)/(2a_0 ))) then, hydrogen radial node will be at the distance of (1) a_0 (2) 2a_0 (3) (a_0 /2) (4) (a_0 /3)

$For 2 s orbital Ψ_{r} = \frac{1}{\sqrt{8}} {(\frac{z}{a_{0}})}^{\frac{3}{2}} (2 - \frac{zr}{a_{0}}) e^{- \frac{zr}{{2 a}_{0}}}$ $then, hydrogen radial node will be at$ $the distance of$ $(1) a_{0}$ $(2) {2 a}_{0}$ $(3) \frac{a_{0}}{2}$ $(4) \frac{a_{0}}{3}$

Question Number 16136 Answers: 1 Comments: 0

Photoelectric emission is observed from a surface when lights of frequency n_1 and n_2 incident. If the ratio of maximum kinetic energy in two cases is K : 1 then (Assume n_1 > n_2 ) threshold frequency is (1) (K − 1) × (Kn_2 − n_1 ) (2) ((Kn_1 − n_2 )/(1 − K)) (3) ((K − 1)/(Kn_1 − n_2 )) (4) ((Kn_2 − n_1 )/(K − 1))

$Photoelectric emission is observed from$ $a surface when lights of frequency n_{1}$ $and n_{2} incident . If the ratio of maximum$ $kinetic energy in two cases is K : 1$ $then (Assume n_{1} > n_{2}) threshold$ $frequency is$ $(1) (K - 1) \times (K n_{2} - n_{1})$ $(2) \frac{K n_{1} - n_{2}}{1 - K}$ $(3) \frac{K - 1}{K n_{1} - n_{2}}$ $(4) \frac{K n_{2} - n_{1}}{K - 1}$

Question Number 16135 Answers: 0 Comments: 0

An electron is moving in 3^(rd) orbit of Hydrogen atom. The frequency of moving electron is (1) 2.19 × 10^(14) rps (2) 7.3 × 10^(14) rps (3) 2.44 × 10^(14) rps (4) 7.3 × 10^(10) rps

$An electron is moving in 3^{rd} orbit of$ $Hydrogen atom . The frequency of$ $moving electron is$ $(1) 2.19 \times 10^{14} rps$ $(2) 7.3 \times 10^{14} rps$ $(3) 2.44 \times 10^{14} rps$ $(4) 7.3 \times 10^{10} rps$

Question Number 16134 Answers: 0 Comments: 0

The mathematical expression which is true for the uncertainty principle is (1) (Δx) (Δv) ≥ (h/(4π)) (2) (ΔE) (Δx) ≥ (h/(4π)) (3) (Δθ) (Δφ) ≥ (h/(4π)) (4) (Δx) (Δm) ≥ (h/(4π))

$The mathematical expression which$ $is true for the uncertainty principle is$ $(1) (Δ x) (Δ v) ⩾ \frac{h}{4 π}$ $(2) (Δ E) (Δ x) ⩾ \frac{h}{4 π}$ $(3) (Δ θ) (Δ ϕ) ⩾ \frac{h}{4 π}$ $(4) (Δ x) (Δ m) ⩾ \frac{h}{4 π}$

Question Number 16133 Answers: 1 Comments: 0

H_α line of Balmer series is 6500 A^o . The wave length of Hγ is (1) 4815 A^o (2) 4298 A^o (3) 7800 A^o (4) 3800 A^o

$H_{α} line of Balmer series is 6500 \overset{o}{A} . The$ $wave length of H γ is$ $(1) 4815 \overset{o}{A}$ $(2) 4298 \overset{o}{A}$ $(3) 7800 \overset{o}{A}$ $(4) 3800 \overset{o}{A}$

Question Number 16102 Answers: 0 Comments: 0

Question Number 16081 Answers: 2 Comments: 0

A spherical balloon of 21 cm diameter is to be filled with hydrogen at NTP from a cylinder containing the gas at 20 atmosphere at 27°C. If the cylinder can hold 2.82 litres of water, calculate the number of balloons that can be filled up.

$A spherical balloon of 21 cm diameter$ $is to be filled with hydrogen at NTP$ $from a cylinder containing the gas at$ $20 atmosphere at 27 ° C . If the cylinder$ $can hold 2.82 litres of water, calculate$ $the number of balloons that can be$ $filled up .$

Question Number 16044 Answers: 1 Comments: 1

A particle is projected horizontally with speed u from point A, which is 10 m above the ground. If the particle hits the inclined plane perpendicularly at point B. [g = 10 m/s^2 ] Find horizontal speed with which the particle was projected.

$A particle is projected horizontally$ $with speed u from point A, which is 10$ $m above the ground . If the particle hits$ $the inclined plane perpendicularly at$ $point B . [g = 10 m / s^{2}]$ $Find horizontal speed with which the$ $particle was projected .$

Question Number 16079 Answers: 1 Comments: 1

An open flask contains air at 27°C. To what temperature it must be heated to expel one-fourth of the air?

$An open flask contains air at 27 ° C . To$ $what temperature it must be heated to$ $expel one - fourth of the air ?$

Question Number 16032 Answers: 0 Comments: 0

Question Number 16027 Answers: 0 Comments: 0

Question Number 15967 Answers: 1 Comments: 1

prove that (4cos9° − 3)(4cos27° − 3) = tan9°

$prove that$ $(4 \cos 9 ° - 3) (4 \cos 27 ° - 3) = \tan 9 °$

Question Number 15961 Answers: 0 Comments: 5

Path of a projectile as seen from another projectile is a (1) Straight line (2) Parabola (3) Ellipse (4) Hyperbola

$Path of a projectile as seen from another$ $projectile is a$ $(1) Straight line$ $(2) Parabola$ $(3) Ellipse$ $(4) Hyperbola$

Question Number 15955 Answers: 0 Comments: 2

The motion of a particle moving along x-axis is represented by the equation (dv/dt) = 6 − 3v, where v is in m/s and t is in second. If the particle is at rest at t = 0, then (1) The speed of the particle is 2 m/s when the acceleration of particle is zero (2) After a long time the particle moves with a constant velocity of 2 m/s (3) The speed is 0.1 m/s, when the acceleration is half of its initial value (4) The magnitude of final acceleration is 6 m/s^2

$The motion of a particle moving along$ $x - axis is represented by the equation$ $\frac{d v}{d t} = 6 - 3 v, where v is in m / s and t is$ $in second . If the particle is at rest at t =$ $0, then$ $(1) The speed of the particle is 2 m / s$ $when the acceleration of particle is$ $zero$ $(2) After a long time the particle moves$ $with a constant velocity of 2 m / s$ $(3) The speed is 0.1 m / s, when the$ $acceleration is half of its initial value$ $(4) The magnitude of final acceleration$ $is 6 m / s^{2}$

Question Number 15932 Answers: 1 Comments: 1

A particle is projected from the foot of an inclined plane having inclination 45°, with the velocity u at an angle θ (> 45°) with the horizontal in a vertical plane containing the line of greatest slope through the point of projection. Find the value of tan θ if the particle strikes the plane (i) Horizontally (ii) Normally

$A particle is projected from the foot of$ $an inclined plane having inclination$ $45 °, with the velocity u at an angle θ$ $(> 45 °) with the horizontal in a vertical$ $plane containing the line of greatest$ $slope through the point of projection .$ $Find the value of \tan θ if the particle$ $strikes the plane$ $(i) Horizontally$ $(ii) Normally$

Question Number 15939 Answers: 0 Comments: 1

Question Number 15906 Answers: 1 Comments: 0

If λ_1 and λ_2 are respectively the wavelengths of the series limit of Lyman and Balmer series of Hydrogen atom, then the wavelength of the first line of the Lyman series of the H-atom is (1) λ_1 − λ_2 (2) (√(λ_1 λ_2 )) (3) ((λ_2 − λ_1 )/(λ_1 λ_2 )) (4) ((λ_1 λ_2 )/(λ_2 − λ_1 ))

$If λ_{1} and λ_{2} are respectively the$ $wavelengths of the series limit of Lyman$ $and Balmer series of Hydrogen atom,$ $then the wavelength of the first line of$ $the Lyman series of the H - atom is$ $(1) λ_{1} - λ_{2}$ $(2) \sqrt{λ_{1} λ_{2}}$ $(3) \frac{λ_{2} - λ_{1}}{λ_{1} λ_{2}}$ $(4) \frac{λ_{1} λ_{2}}{λ_{2} - λ_{1}}$

Question Number 15881 Answers: 1 Comments: 1

Question Number 15880 Answers: 2 Comments: 0

Question Number 15856 Answers: 1 Comments: 0

A particle is moving along a straight line with uniform acceleration has velocities 7 m/s at P and 17 m/s at Q. If R is the midpoint of PQ, then the average velocity between P and R is?

$A particle is moving along a straight$ $line with uniform acceleration has$ $velocities 7 m / s at P and 17 m / s at Q .$ $If R is the midpoint of P Q, then the$ $average velocity between P and R is ?$

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