Physics - Online Test
Q1. A capillary tube remains dipped in a water container, so that loss in weight of the capillary tube is
Answer : Option D
Explaination / Solution:
No Explaination.
Q2. Calculate the change in internal energy of 3.00 mol of helium gas when its temperature is increased by 2.00 K.
Answer : Option D
Explaination / Solution:
Helium is a monoatomic gas.(CV = 1.5R)
change in internal energy
Q3.
A thin convergent glass lens ( = 1.5 ) has a power of + 5.0 D. When this lens is immersed in a liquid of refractive index it acts as a divergent lens of focal length 100 cm. The value of must be
Answer : Option D
Explaination / Solution:
No Explaination.
Q4.
The end product of the decay of .The number of alpha and beta particles emitted are
Answer : Option C
Explaination / Solution:
No Explaination.
Q5. A steel railroad track has a length of 30.000 m when the temperature is 0.0C. What is its length when the temperature is 40.0C? (C)
Answer : Option B
Explaination / Solution:
Total length after expansion = 30 + 0.013 = 30.013m
Q6. The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m, and 2.01 cm respectively. Give the volume of the sheet to correct significant figures.
Answer : Option C
Explaination / Solution:
length, l = 4.234 m
breadth,b = 1.005 m
thickness, t = 2.01 cm = 2.01 × 10-2 m
volume = l × b × t
=> V = 4.234 × 1.005 × 0.0201 = 0.0855289 = 0.0855 m3 (Significant Figures = 3)
Q7. An L-R-C series circuit has phase angle .The voltage amplitude of the source is 90.0 V. Voltage amplitude across the resistor is
Answer : Option A
Explaination / Solution:
in L-R-C circuit phaser diagram
hence,
Q8. A particle executes SHM of time period T, the time period with which the total energy changes is
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. A bar magnet of magnetic moment 1.5 J/T lies aligned with the direction of a uniform magnetic field of 0.22 T. What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment opposite to the field direction?
Answer : Option D
Explaination / Solution:
No Explaination.
Q10. Shape of the wave front of portion of the wave front of light from a distant star intercepted by the Earth
Answer : Option A
Explaination / Solution:
Stars are very far away from earth.Near the star the shape is spherical but by the time its light reaches earth the portion of the wavefront is plane due to increase in radius.
