Question 11 Mark
Which is smaller: micron or Fermi?
Answer
View full question & answer→$1$ Fermi is smaller because $1$ Fermi is $10^{-15} m$ while $1$ micron is $10^{-6} m$.
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Question 21 Mark
Which is bigger: light year or parsec?
Answer
View full question & answer→1 Parsec is bigger because 1 Parsec is 3.26 times a light year.
Question 31 Mark
Define the light year.
Answer
View full question & answer→A light year is defined as the distance travelled by light in a vacuum in one year.
Question 41 Mark
Name the SI unit of electric current.
Answer
View full question & answer→SI unit of electric current is Ampere (A).
Question 51 Mark
Draw a neat diagram of a simple pendulum. Show on it the effective length of the pendulum and its one oscillation .
Answer
View full question & answer→Simple Pendulum :
Question 61 Mark
Define the terms : time period as related to a simple pendulum.
Answer
View full question & answer→Time period: This is the time taken to complete one oscillation. It is measured in second (s).
Question 71 Mark
Define the following terms with reference to a simple pendulum:
Frequency
Answer
View full question & answer→Frequency -the number of oscillations made by the pendulum in one second is called frequency. Its SI unit is Hertz (Hz).
Question 81 Mark
Define the following terms with reference to a simple pendulum:
Amplitude
Answer
View full question & answer→Amplitude - Amplitude is the magnitude of the maximum deviation of the bob from the mean position on either side when an oscillation takes place.
Question 91 Mark
Define the following terms with reference to a simple pendulum:
Oscillation
Answer
View full question & answer→Oscillation - One complete to and fro motion of a pendulum about its mean position is known as oscillation.
Question 101 Mark
What is meant by measurement?
Answer
View full question & answer→Measurement is an act or the result of a comparison of a quantity whose magnitude is unknown with a predefined standard.
Question 111 Mark
Define the following terms with reference to a simple pendulum:
Amplitude
Answer
View full question & answer→Amplitude - Amplitude is the magnitude of the maximum deviation of the bob from the mean position on either side when an oscillation takes place.
Question 121 Mark
Define the following terms with reference to a simple pendulum:
Frequency
Answer
View full question & answer→Frequency -the number of oscillations made by the pendulum in one second is called frequency. Its SI unit is Hertz (Hz).
Question 131 Mark
Define the following terms with reference to a simple pendulum:
Time period
Answer
View full question & answer→Time period - The time taken by a simple pendulum for oscillation is known as the time period of a simple pendulum.
Question 141 Mark
Define the following terms with reference to a simple pendulum:
Oscillation
Answer
View full question & answer→Oscillation - One complete to and fro motion of a pendulum about its mean position is known as oscillation.
Question 151 Mark
Define standard meter.
Answer
View full question & answer→A standard metreis equal to 1650763.73 wavelengths in vacuum, of the radiation from krypton isotope of mass 86.
Question 161 Mark
What are the derived units?
Answer
View full question & answer→The units which can be expressed in terms of fundamental units of mass, length, and time are known as derived units.
Question 171 Mark
What is the relation between frequency (f) and time period (T)?
Answer
View full question & answer→The time period, T and frequency of oscillation, f are related as,
T = 1/ for f = 1/T
T = 1/ for f = 1/T
Question 181 Mark
Is oscillation the same as vibration?
Answer
View full question & answer→Yes, the vibration is the same as the oscillation.
Question 191 Mark
Express light year in terms of meter.
Answer
View full question & answer→1 light year $=9.46 \times 10^{15} m$
Question 201 Mark
Express micron in terms of meter.
Answer
View full question & answer→$1$ micron $= 10^{-6} m.$
Question 211 Mark
What is the unit for the least count of an instrument?
Answer
View full question & answer→The unit of the Least count of an instrument is cm.
Question 221 Mark
How many types of motions does a screw have?
Answer
View full question & answer→The screw has two types of motions: linear and circular motions.
Question 231 Mark
What is meant by a unit?
Answer
View full question & answer→The unit is a standard quantity of the same kind with which a physical quantity is compared for measuring it.
Question 241 Mark
What is the least count of your laboratory vernier calipers?
Answer
View full question & answer→Least count of a vernier caliper used in laboratory is 0.1mm = 0.01cm
Question 251 Mark
What is the least count in the case of the following instrument?
Spring balance
Answer
View full question & answer→The least count of the following is
Spring balance = 1 gm wt
Spring balance = 1 gm wt
Question 261 Mark
What is the least count in the case of the following instrument?
Thermometer
Answer
View full question & answer→The least count of the following is
Thermometer= 0.1°c
Thermometer= 0.1°c
Question 271 Mark
What is the least count in the case of the following instrument?
Stopwatch
Answer
View full question & answer→The least count of the following is
Stopwatch= 0.1 s
Stopwatch= 0.1 s
Question 281 Mark
What is the least count in the case of the following instrument?
Screw gauge
Answer
View full question & answer→The least count of the following is
Screw gauge = 0.001 cm
Screw gauge = 0.001 cm
Question 291 Mark
What is the least count in the case of the following instrument?
vernier calipers
Answer
View full question & answer→The least count of the following is
Vernier call pers = 0.01 cm
Vernier call pers = 0.01 cm
Question 301 Mark
What is the least count in the case of the following instrument?
Metre scale
Answer
View full question & answer→Least count of the following is
Metre scale = 0.1 cm
Metre scale = 0.1 cm
Question 311 Mark
What do you mean by the slope of a graph?
Answer
View full question & answer→The slope of a graph identifies the proportional relationship between the quantities plotted.
Question 321 Mark
What is the maximum possible error in the measurement of 1.80 cm?
Answer
View full question & answer→The maximum possible error is 0.1 cm.
Question 331 Mark
Write the SI unit of amplitude.
Answer
View full question & answer→SI unit of amplitude is metre (m).
Question 341 Mark
Is there any relation between oscillation and amplitude?
Answer
View full question & answer→Amplitude is the magnitude of the maximum displacement of the bob from the mean position on either side when an oscillation takes place.
Question 351 Mark
What do you mean by an oscillation?
Answer
View full question & answer→One complete to and fro motion of a pendulum about its mean position is known as oscillation.
Question 361 Mark
State the relation between frequency and time period.
Answer
View full question & answer→The time period, T and frequency of oscillation, f are related as,
T = 1/f or f = 1/T
T = 1/f or f = 1/T
Question 371 Mark
Define one hertz.
Answer
View full question & answer→When a pendulum completes one oscillation in one second, then the frequency is one hertz.
Question 381 Mark
Write the SI unit of frequency?
Answer
View full question & answer→SI unit of frequency is hertz (Hz).
Question 391 Mark
Name a device used to measure the short intervals of time.
Answer
View full question & answer→A stopwatch is used to measure short intervals of time.
Question 401 Mark
What is a seconds pendulum?
Answer
View full question & answer→A seconds pendulum is a pendulum which takes $2$ seconds to complete one oscillation. The length of the seconds pendulum, where $g =9.8 ms^{-2}$, is nearly 1 m .
Question 411 Mark
Write the SI units of time and mass.
Answer
View full question & answer→SI units of time and mass are second (s) and kilograms (kg) respectively.
Question 421 Mark
Does the time period of a simple pendulum depend on the mass of the bob?
Answer
View full question & answer→The time period of a pendulum is independent of the mass of the bob.
Question 431 Mark
What is the purpose of a ratchet in a screw gauge?
Answer
View full question & answer→The ratchet is used in a screw gauge to hold the object under measurement gently between the studs.
Question 441 Mark
Explain the term least count of a screw gauge. How are they determined?
Answer
View full question & answer→Least count refers to the smallest reading that can be accurately measured while using an instrument. The least count is the value of one division on its scale.
Question 451 Mark
Is pitch the same as least count?
Answer
View full question & answer→No, the least count is not the same as pitch because the least count is found by dividing pitch by a number of divisions on the circular scale.
Question 461 Mark
Express $1$ liter in terms $m^3.$
Answer
View full question & answer→$1 m^3 = 1000 litre$
$1 litre = 1/1000 m^3$
$= 0.001 m^3$
$1 litre = 1/1000 m^3$
$= 0.001 m^3$
Question 471 Mark
Is $1 cm^3 $the same as $1$ ml?
Answer
View full question & answer→Yes, $1 cm^3 $is the same as $1 ml.$
Question 481 Mark
What do you mean by the term volume of a body?
Answer
View full question & answer→The space occupied by a body is known as its volume. SI unit of volume is cubic metre $(m^3)$
Question 491 Mark
Name the instrument which has the least count
0.01 mm
0.01 mm
Answer
View full question & answer→Screw gauge
Question 501 Mark
Name the instrument which has the least count
1 mm
1 mm
Answer
View full question & answer→Metre scale