Physics - Experimental Physics
Exam Duration: 45 Mins Total Questions : 25
If in a screw gauge, zero mark of the circular scale remains on right of reference line and does not cross it and 2nd division on circular scale comes on referrence line, then zero correction is
- (a)
-0.02mm
- (b)
-0.002mm
- (c)
+0.02mm
- (d)
-0.2mm
For a simple pendulum, when a graph is plotted betwen displacement d, KE=\(1\over 2\)mv2 and PE=mgh, taking d along X-axis and \(1\over 2\)mv2 and mgh along Y-axis, the graph comes as
- (a)
- (b)
- (c)
- (d)
The length of the string of a simple pendulum is mmeasured with a meter scale to be 92.0cm, the radius of the bob plus the hook is measured with the help of vernier callipers to be 2.17cm.Mark out the correct statement(s).
- (a)
Least count of meter scale is 0.1 cm
- (b)
Least count of vernier callipers is 0.01cm
- (c)
Effective length of simple pendulum is 94.2cm
- (d)
All of the above
Two wire A and B have same lengths and made of the same material but A is thicker than B. Both are subjected to the same extending load. Which will extend more?
- (a)
A
- (b)
B
- (c)
Same extension
- (d)
Can't predict
When a glass capillary tube of radius 0.015 cm is dipped in water, the water rises to a height of 15 cm within it. Assuming contact angle between water and glass to be \(0^o\) , the surface tension of water is
\([\rho _{water}= 1000\ kg^{-m^3, g = 9.81\ ms^{-2}}]\)
- (a)
\(0.11\ Nm^{-1}\)
- (b)
\(0.7\ Nm^{-1}\)
- (c)
\(0.072\ Nm^{-1}\)
- (d)
None of these
In the experiment of measuring speed of sound by resonance tube, it is observed that for tuning fork of frequency v = 480 Hz, length of air column in cm, \(l_1=30\ cm, l_2=70\ cm\) then \(v_1\) is equal to
- (a)
\(338\ ms^{-1}\)
- (b)
\(379\ ms^{-1}\)
- (c)
\(384\ ms^{-1}\)
- (d)
\(332\ ms^{-1}\)
In an experiment of determining coefficient of viscosity, one lead shot A is having radius \(r_1\) and the other B is having \(r_1/2.\) Which one will fall fast?
- (a)
A
- (b)
B
- (c)
Both with same speed
- (d)
None of the above
With a concave mirror, an object is placed at a distance x, from the principal focus, on the principal axis. The image is formed at a distance \(x_2.\) From the principal focus, the focal length of the mirror is
- (a)
\(x_1\over x_2\)
- (b)
\(x_1+6 x_2\)
- (c)
\(\sqrt{x_1\ x_2}\)
- (d)
\(x_1\ x_2\)
Young's modulus of steel is \(2\times10^{11}Nm^{-1}.\) A steel wire has a length of 1 m and area of cross-section \(1\ mm^2.\)
The work required to increase its length by 1 mm is
- (a)
2 J
- (b)
0.1 J
- (c)
1.5 J
- (d)
3 J
A student measured the length of a rod and wrote it as 3.50 cm. Which instrument did he use to measure it?
- (a)
A meter scale
- (b)
A vernier calliper where the 10 divisions in vernier scale matches with 9 division in main scale and main scale has 10 division in 1 cm
- (c)
A screw gauge having 100 divisions in the circular scale and pitch as 1 mm
- (d)
A screw gauge having 50 divisions in the circular scale and pitch as 1 mm
In a metre bridge experiment, null point is obtained at 40 sm from one end of the wire when resistance X is end of the wire when resistance X is balanced against another resistance Y. If X < Y, then the new position of the null points from the same end, if one decides to balance a resistance of 3X against Y, will be close to
- (a)
80 cm
- (b)
75 cm
- (c)
67 cm
- (d)
50 cm
A spectrometer gives the following readings when used to measure the angle of a prism. Main scale reading is 58.5 degree. Vernier scale reading is 09 division. Given that 1 division on main scale corresponds to 0.5 degree. Total divisions on the vernier scale is 30 and match with 29 divisions of the main scale. The angle of the prism from the above data is
- (a)
\(58.59^o\)
- (b)
\(58.77^o\)
- (c)
\(58.65^o\)
- (d)
\(59^o\)
A screw gauge gives the following reading when used to measure the diameter of wire. Main scale reading is 0 mm.
Circular scale reading is 52 divisions. Given that 1 mm on main scale corresponds to 100 divisions of the circular scale.
The diameter of wire from the above data is
- (a)
0.052 cm
- (b)
0.026 cm
- (c)
0.005 cm
- (d)
0.52 cm
In an experiment, the angles are required to be measured by an instrument having 29 divisions of main scale coincide with 30 divisions of the mirror scale. If the smaller division of the main scale is half of a degree \((=0.5^o)\). then the least count of the instrument is
- (a)
half minute
- (b)
one degree
- (c)
half degree
- (d)
one minute
An experiment is performed to find the refractive index of glass using a travelling microscope. In this experiment, distances are measured by
- (a)
a vernier scale provided on the microscope
- (b)
a standard laboratory scale
- (c)
a meter scale provided on the microscope
- (d)
a screw gauge provided on the microscope
A student measures the focal length of a convex lens by putting an object pin at a distance u from the lens and measuring the distance v of the image pin. The graph between u and v plotted by the student should look like
- (a)
- (b)
- (c)
- (d)
A working transistor with its three legs marked P, Q and R is tested using a multimeter. No conduction is found between P and Q. By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal to P or Q, some conduction is seen on the multimeter. Which of the following is true for the transistor?
- (a)
It is a n-p-n transistor with R as base
- (b)
It is a p-n-p transistor with R as collector
- (c)
It is a p-n-p transistor with R as emitter
- (d)
It is a n-p-n transistor with R as collector
A capillary tube (A) is dipped 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?
- (a)
- (b)
- (c)
- (d)