List of practice Questions

A horizontal bridge is built across a river. A student standing on the bridge throws a small ball vertically upwards with a velocity \(4\ ms^{-1}\). The ball strikes the water surface after \(4s\). The height of bridge above water surface is
(Take: \(g=10\ ms^{-2}\))
The metal which is extracted by oxidation and subsequent reduction from its ore is:
Derive laws of reflection of light using Huygens’ principle.
Identify the error in the following sentence and choose the correct option :
"The team have been practicing every day for the upcoming tournament."
If \[ A = \begin{bmatrix} 1 & -2 & 3 \\ -4 & 2 & 5 \end{bmatrix}, B = \begin{bmatrix} 2 & 3 \\ 4 & 5 \\ 2 & 1 \end{bmatrix} \] find the matrix $AB$.
Ten identical cells each emf 2V and internal resistance 1Ω are connected in series with two cells wrongly connected. A resistor of 10Ω is connected to the combination. What is the current through the resistor?
A full-wave rectifer with diodes D1 and D2 is used to rectify 50 Hz alternating voltage. The diode D1 conducts _______ times in one second.
Which amongst the following options is the correct relation between change in enthalpy and change in internal energy
In a row of students. the position of the Vikas from the left side of the row is 8th and the position of Vikas from the right side of the row is 38th. find the total number of students in the row?
Identify the pattern in the number series and complete the sequence: 3, 8, 15, 24, __, __
If \(a\) and \(b\) are whole numbers such that \(ab = 121\), find the value of \((a-1)b + 1\).

As shown in figure, a $70 kg$ garden roller is pushed with a force of $\vec{F}=200 N$ at an angle of $30^{\circ}$ with horizontal. The normal reaction on the roller is (Given $g=10 m s ^{-2}$ )

Fill in the blanks with the correct articles: I saw ........... interesting movie last night. It was ............. thriller that kept me on ............. edge of ............... seat.
Let $y=x+2,4 y=3 x+6$ and $3 y=4 x+1$ be three tangent lines to the circle $(x-h)^2+(y- k )^2= r ^2$ Then $h + k$ is equal to :
Arrange the words in the correct order to form a grammatically sound sentence :
a) Yesterday
b) to
c) the
d) library
e) I
f) went
Choose the correct order :
Spot the error in the following sentence and choose the appropriate option.
Democracy is the system in which people could exercise some control over their rulers.
The given sentence is divided into three parts. Scan it carefully for errors and choose the most appropriate options
A) I found less B) books in the C) library than that
The given sentence is divided into tissue parts, scan it carefully for errors and choose the most appropriate options
A) Few persons
B) are free
C) from worries
Read the following sentence care. Some part of the sentence may have an error. Choose the most appropriate options.
Mumbai (A) | is New York (B) | of India (c)
Read the sentence to find out if there is an error and choose the corresponding answer
A. Climatic shifts are
B. so grateful they can be
C. indistinguishable at first
D. from ordinary fluctuations
E. in the weather
Choose the correct answer from the options given below:
Identify the error in the following sentence.
Each girl and each boy was given a red pencil.
Identify the error in the following sentence.
He was not able to concentrate because of the continual music being played next door.
Some part of the sentence is grammatically incorrect. Pick the error.
Another surprising change that I noticed in him in recent times is that he avoids to speak to me.
Find out which part of the sentence has an error.
The boat was overloaded (A)/ with the passengers (B)/ and as a result it got drowned. (C)/ No error (D) Which part of the sentence above has an error, if any?