Subject

Physics

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of divisions on the circular scale is 50. Further, it is found that the screw gauge has a zero error of − 0.03 mm while measuring the diameter of a thin wire, a student notes the main scale reading of 3 mm and the number of circular scale divisions in line with the main scale as 35. The diameter of the wire is

  • 3.32 mm 

  • 3.73 mm

  • 3.67 mm

  • 3.67 mm

245 Views

12.

A spherical solid ball of volume V is made of a material of density ρ1. It is falling through a liquid of density ρ221). Assume that the liquid applies a viscous force on the ball that is proportional to the square of its speed v, i.e., Fviscous = −kv2 (k>0). The terminal speed of the ball is

  • square root of fraction numerator Vg left parenthesis straight rho subscript 1 minus straight rho subscript 2 right parenthesis over denominator straight k end fraction end root
  • Vgρ subscript 1 over straight k
  • square root of Vgρ subscript 1 over straight k end root
  • square root of Vgρ subscript 1 over straight k end root
442 Views

13.

While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of 18 cm during winter. Repeating the same experiment during summer, she measures the column length to be x cm for the second resonance.Then 

  • 18 > x

  • x >54

  • 54 > x > 36 

  • 54 > x > 36 

435 Views

14.

The speed of sound in oxygen (O2) at a certain temperature is 460 ms−1. The speed of sound in helium (He) at the same temperature will be (assumed both gases to be ideal)

  • 1420 ms−1

  • 550 ms−1

  • 375 ms−1

  • 375 ms−1

886 Views

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15.

A jar filled with two non-mixing liquids 1 and 2 having densities ρ1 and ρ2 respectively. A solid ball, made of a material of density ρ3, is dropped in the jar. It comes to equilibrium in the position shown in the figure.
Which of the following is true for ρ1, ρ2 and ρ3?

  • ρ3 < ρ1 < ρ2

  • ρ1 < ρ3 < ρ2

  • ρ1 < ρ2 < ρ3

  • ρ1 < ρ2 < ρ3

577 Views

16.

A capillary tube (A) is dropped in water. Another identical tube (B) is dipped in a soap water solution.Which of the following shows the relative nature of the liquid columns in the two tubes? 

796 Views

17.

A wave travelling along the x-axis is described by the equation y(x, t) = 0.005 cos (αx −βt). If the wavelength and the time period of the wave are 0.08 m and 2.0 s, respectively, then α and β in appropriate units are 

  • α = 25.00 π, β = π

  • α = 0.08/ π,  2.0/π

  • α = 0.04 / π , β =1.0/π

  • α = 0.04 / π , β =1.0/π

349 Views

18.

An insulated container of gas has two chambers separated by an insulating partition. One of the chambers has volume V1 and contains ideal gas at pressure P1 and temperature T1. The other chamber has volume V2 and contains ideal gas at pressure P2 and temperature T2. If the partition is removed without doing any work on the gas, the final equilibrium temperature of the gas in the container will be

  • fraction numerator straight T subscript 1 straight T subscript 2 space left parenthesis straight P subscript 1 straight V subscript 1 space plus space straight P subscript 2 straight V subscript 2 right parenthesis over denominator straight P subscript 1 straight V subscript 1 straight T subscript 2 space plus space straight P subscript 2 straight V subscript 2 straight T subscript 1 end fraction
  • fraction numerator left parenthesis straight P subscript 1 straight V subscript 1 space straight T subscript 1 plus space straight P subscript 2 straight V subscript 2 straight T subscript 2 right parenthesis over denominator straight P subscript 1 straight V subscript 1 space plus space straight P subscript 2 straight V subscript 2 end fraction
  • fraction numerator left parenthesis straight P subscript 1 straight V subscript 1 space straight T subscript 2 plus space straight P subscript 2 straight V subscript 2 straight T subscript 1 right parenthesis over denominator straight P subscript 1 straight V subscript 1 space plus space straight P subscript 2 straight V subscript 2 end fraction
  • fraction numerator left parenthesis straight P subscript 1 straight V subscript 1 space straight T subscript 2 plus space straight P subscript 2 straight V subscript 2 straight T subscript 1 right parenthesis over denominator straight P subscript 1 straight V subscript 1 space plus space straight P subscript 2 straight V subscript 2 end fraction
405 Views

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19.

Shown in the figure below is a meter-bridge set up with null deflection in the galvanometer.

The value of the unknown resistor R is

  • 13.75 Ω

  • 220 Ω

  • 110 Ω

  • 110 Ω


B.

220 Ω

124 Views

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20.

A parallel plate capacitor with air between the plates has a capacitance of 9 pF. The separation between its plates is ‘d’. The space between the plates is now filled with two dielectrics. One of the dielectrics has dielectric constant k1 = 3 and thickness d/3 while the other one has dielectric constant k2 = 6 and thickness 2d/3 . Capacitance of the capacitor is now 

  • 1.8 pF 

  • 45 pF

  • 40.5 pF

  • 40.5 pF

162 Views

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