General Knowledge Quiz (Previous Years) for NDA & Other Defence Exams: 15th April
Q1. Flow
velocities in an incompressible fluid can be measured with which one of the
following?
(a) Barometer
(b) Venturi
tube
(c) Strain
gauge
(d) Manometer
Q2. A
syringe is a hollow glass tube with lower end tapered to a nozzle. Due to which
one of the following liquids can be drawn into a syringe?
(a) Partial
vacuum produced inside the glass tube
(b) Diffusion
(c) Surface
tension effect
(d) Capillary
action
Q3. The mass of water vapor per
unit volume of air is known
(a) relative
humidity
(b) specific
humidity
(c) absolute
humidity
(d) variable
humidity
Q4. Kinetic
viscosity of a given liquid is the ratio of the
(a) coefficient
of viscosity to the density
(b) coefficient
of viscosity to the surface tension
(c) density
to the coefficient of viscosity
(d) surface
tension to the coefficient of viscosity
Q5. When oil
floats on water, the surface tension of water
(a) vanished
immediately
(b)
decreases considerably
(c) increases
considerably
(d) remains
unaffected
Q6. Consider
two hollow glass spheres, one containing water and the other containing
mercury. Each liquid fills about one-tenth of the volume of the sphere. In zero
gravity environment
(a) water
and mercury float freely inside the sphere
(b) water
forms a layer on the glass, while mercury floats
(c) mercury
forms a layer on the glass, while water floats
(d) water
and mercury both form a layer on the glass
Q7. The
density of cast iron having specific gravity 7.20 is
(a) 7.20
kg/m³
(b) 720
kg/m³
(c) 72 kg/m³
(d) 7200
km/m³
Q8. A vessel
contains oil density 0.8 gm/cm³ over mercury of density 13.6 gm/cm³. A
homogeneous sphere floats with half of its volume immersed in mercury and the
other half in half of its volume immersed in mercury and the other half in oil.
The density of the material of the sphere in CGS unit is
(a) 3.3
(b) 6.4
(c) 7.2
(d) 12.8
Q9. Water
flows out of the hole of a bucket and follows a parabolic path. If the bucket
falls freely under gravity, the water flow (ignoring air resistance)
(a) follows
a straight-line path relative to the falling bucket
(b) follows
a parabolic path relative to the falling bucket
(c) stops
(d) decreases
but continues to flow
SOLUTIONS
S1. Ans.(b)
Sol. Barometer, venturi meter, Strain Gauge
and Manometer are used to measure atmospheric pressure, velocity of an in-compressible fluid, strain and pressure respectively.
S2. Ans.(a)
Sol. When
piston is pulled, partial vacuum is created inside the tube due to which
pressure becomes negligible and hence the liquid enters the tube because of its
pressure.
S3. Ans.(c)
Sol. The
absolute humidity may be defined as the mass of water vapor per unit volume of
air.
S4. Ans.(c)
Sol. Kinetic
viscosity of given liquid is the ratio of the density to the coefficient of
viscosity.
S5. Ans.(b)
Sol. When
oil floats on water, the surface tension of water decrease considerably.
S6. Ans.(b)
Sol. In zero
gravity environment water forms a layer on the glass, while mercury floats.
S9. Ans.(b)
Sol. If the
bucket falls freely under gravity, the water flow follows a parabolic path
relative to the falling bucket.
No comments