General Science - Online Test
Q1. The flow of current is possible in Daniel cell only
Answer : Option B
Explaination / Solution:
The flow of current is possible only due to potential difference.
Q2. Greatest biological problems faced by human being is
Answer : Option B
Explaination / Solution:
The population is growing very fastly all over the world. Increased population demands more and more natural resources. Population explosion is the greatest biological problem faced by human beings world over.
Q3. In a two sector circular flow model the two sectors are
Answer : Option B
Explaination / Solution:
No Explaination.
Q4. For a parallel plate capacitor ______________ possible potential difference between the capacitor plates
Answer : Option B
Explaination / Solution:
When a dielectric is introduced between two charged plates of a capacitor having a charge Q and maintained at a potential difference of V, a reverse electric field is set up inside the dielectric due to dielectric polarization.
This reduces the electric field in between the plates. The potential is also reduced. Maximum potential is dependent on the charge on the plates. As the charge remains constant, the presence of the dielectric decreases the maximum potential between the plates.
This reduces the electric field in between the plates. The potential is also reduced. Maximum potential is dependent on the charge on the plates. As the charge remains constant, the presence of the dielectric decreases the maximum potential between the plates.
Q5. Yellow colour of NaCl crystals in sodium vapour is due to
Answer : Option D
Explaination / Solution:
It’s a F center defect.
Q6. Some polymers are called thermoplastic polymers because
Answer : Option C
Explaination / Solution:
Thermoplastic polymer get soften on heating and gets harden on cooling.
Q7. Fluorine reacts with H2S to produce
Answer : Option C
Explaination / Solution:
3F2+ H2S→SF4+ 2HF
Q8. The coefficient of price elasticity of demand is always
Answer : Option A
Explaination / Solution:
No Explaination.
Q9. A child swinging on a swing in a sitting position stands up. Then, the time period of the swing will
Answer : Option C
Explaination / Solution:
As the child stand up then Centre of mass is shifted in upwards direction from the sitting position of child, thus decreasing the effective length of the swing, so as the time period is proportion to square root of length, thus time period decreases.
time period
Time period of swing decreases as effective length decreases.
Q10. If is the density of the fluid flowing with a speed v, D stands for the dimension of the pipe, and is the viscosity of the fluid Reynolds number is given by
Answer : Option A
Explaination / Solution:
It is a dimension less number comprised of the physical characteristics of the flow. An increasing Reynolds number indicates an increasing turbulence of flow.
It is defined as:
where;
v is the flow velocity
D is a characteristic linear dimension
ρ fluid density(kg/m3)
is dynamic viscosity (Pa.s)
ν kinematic viscosity (m2/s),
