The estimated time for Abu and Ali to repair a
faulty car is six hours. If Abu used 10 hours to
repair the car, how many hours will Ali use to repair
the car?
A concave lens of focal length 60cm
is made of material whose
refractive index for red light is
1.641 and refractive index for blue
light is 1.659.That for white light
is 1.65.It is combined with a convex
lens of dispersive power 0.0173 to
form an achromatic doublet.
Calculate the focal length of the
achromatic lens.
A student holding a 324Hz tuning
fork approaches a wall at a speed
of 6ms^(−1) .The speed of sound in air
is 336ms^(−1) .What frequency will
the student detect from waves
omitted from the fork and waves
coming from the wall?
The length of mercury column in
a mercury-in-glass thermometer
is 4cm at triple point.What is the
length of the column when the
scale indicates temperature of
560K.
If a fraction is added to its denominator , it reduces to (1/2) and
when the same fraction added to numerator, it also reduces to (2/3)
(a) what is the fraction
(b) find the square root such that the result of the fraction is less
than 1
The tens digit of a two digit number is 3 greater than the units digit.
When the digits are reversed, the number is reduced by 27.
what is the number ?