Home/Class 7/Maths/

Question and Answer

Question

Copy the diagram and complete each shape to be symmetric about the mirror line(s):

Answer

All these diagrams are show in the videos.
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
To Keep Reading This Answer, Download the App
4.6
star pngstar pngstar pngstar pngstar png
Review from Google Play
Correct54
Incorrect0
Watch More Related Solutions
An object having a velocity 4.0 m/s is accelerated at the rate of \({1.2}\frac{{m}}{{s}^{{2}}}\) for 5.0s. Find the distance travelled during the period of acceleration.
A heavy stoen is thrown from a cliff of height h in a given direction. The speed with which it hits the ground
(A) must depend on the speed of projection
(B) must be larger than the speed of projection
(C) must be independent of the speed of projection
(D) may be smaller than the speed of projection
Water and mercury are filled in towi cylinderical vessels up to same height. Both vesels hve a hole in thewal near the bottom. The velocity of water and mercury coming out of the holes are \({v}_{{1}}{\quad\text{and}\quad}{v}_{{2}}\) respectively.
(A) \({v}_{{1}}={v}_{{2}}\)
(B) \({v}_{{1}}={13.6}{v}_{{2}}\)
(C) \({v}_{{1}}=\frac{{v}_{{2}}}{{13.6}}\)
(D) \({v}_{{1}}=\sqrt{{{13.6}}}{v}_{{2}}\)
A rectangular coil of 100 turns has length 5 cm and width 4 cm. it is placed with its plane parallel to a uniform magnetic field and a current of 2 A is sent through the coil. Find the magnitude of the magnetic field B, if the torque acting on the coil is \({0.2}{N}{m}^{{-{1}}}.\)
An inductor \({\left({L}={20}{m}{H}\right)}\), a resistor \({\left({R}={100}\Omega\right)}\) and a battery (verepsilon = 10 V) are connected in series. After along time the circuit is short- circuited and then the battery is disconnected. Find the current in the cirucit 1ms after short- circuititig.
The peak power consumed by a resistive coil when connected to an AC source is \({80}{W}\). Find the energy consumed by the coil in 1000 seconds which is many times larger than the time period of the source.
The graph of \({1}{n}{\left(\frac{{R}}{{R}_{{0}}}\right)}\) versus \({1}{n}{A}{\left({R}={r}{a}{d}{i}{u}{s}\right.}\) of a nucleus and \({A}=\) its mass number) is
(A) a straight line
(B) a parabola
(C) an ellipse
(D) none of them
Through what potential difference should an electron be accelerated to give it a speed of
(a) \(0.6c\), (b) \(0.9c\), and (c)\(0.99c\)?
A student performs an experiment an for determination of \({g{{\left(=\frac{{{4}\pi^{{{2}}}{l}}}{{{T}^{{{2}}}}}\right)}}}\). The error in length \({l}\) is \(\Delta{l}\) and in time \({T}\) is \(\Delta{T}{\quad\text{and}\quad}{n}\) is number of times the reading is taken. The measurment of \({g}\) is most accurate for
(a) \(\Delta{l}={5}{m}{m},\Delta={0.2}{\sec},{n}={10}\)
(b) \(\Delta{l}={5}{m}{m},\Delta={0.2}{\sec},{n}={20}\)
(C) ( c ) \(\Delta{l}={5}{m}{m},\Delta={0.1}{\sec},{n}={10}\)
(D) ( d ) \(\Delta{l}={1}{m}{m},\Delta={0.1}{\sec},{n}={50}\)
The root-mean square speeds of the molecules of different ideal gses, maintained at the same temperature are the same.

Load More