Physics

# The least count of a stop watch is 0.2 second.The time of 20 oscillations of a pendulum is measured to be 25 seconds.The percentage error in time period is

0.8%

##### SOLUTION
Percentage error=$\dfrac{least \quad count}{measurement} \times 100$
$=\dfrac{0.2}{25} \times 100=0.8$ %

You're just one step away

Single Correct Medium Published on 18th 08, 2020
Questions 244531
Subjects 8
Chapters 125
Enrolled Students 199

#### Realted Questions

Q1 Matrix Medium
Match the following two columns.
 Column I Column II
 $\displaystyle GM_{e}M_{5}$ $\displaystyle \left [ M^{2}L^{2}T^{3} \right ]$ $\displaystyle \frac{3RT}{M}$ $\displaystyle \left [ ML^{3}T^{-2} \right ]$ $\displaystyle \frac{F^{2}}{q^{2}B^{2}}$ $\displaystyle \left [ L^{2}T^{-2} \right ]$ $\displaystyle \frac{GM_{e}}{R_{e}}$ None

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q2 Single Correct Medium
A projectile fired at an angle of $45^{\circ}$ travels a total distance $R$, called the range, which depends only on the initial speed $v$ and the acceleration of gravity $g$. Using dimensional analysis, find how $R$ depends on the speed and on $g$.
• A. $R\,\alpha\,\displaystyle\frac{v^2}{g}$
• B. $R\,\alpha\,\displaystyle\frac{v}{g^2}$
• C. $R\,\alpha\,\displaystyle\frac{g}{v^2}$
• D. None of these

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q3 Single Correct Hard
The length $\ell$, breadth b and thickness t of a block of wood were measured with the help of a measuring scale. The results with permissible errors are $\ell$ = 15.12 $\pm$ 0.01 cm, t = 5.28 $\pm$ 0.01 cm. $b$ = 10.15 $\pm$ 0.01 cm. The percentage error in volume upto proper significant figures is :
• A. 0.28%
• B. 0.36%
• C. 0.48%
• D. 0.64%

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q4 Single Correct Medium
Which of the following pair does not have the same dimensions?
• A. Moment of inertia and Torque
• B. Linear Momentum and impulse
• C. Angular Momentum and Plank's constant
• D. Work and internal energy

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020

Q5 Single Correct Medium
Light years is the unit of:
• A. time
• B. length
• C. mass
• D. none of these

Asked in: Physics - Units and Measurement

1 Verified Answer | Published on 18th 08, 2020