General Science - Online Test
Q1. Crop rotation is used by farmers to increase
Answer : Option A
Explaination / Solution:
Crop rotation is the method of agriculture in which leguminous plants are grown between two cereal crops. The root nodule of these bacterium fix the atmospheric nitrogen and increase the fertility of soil.
Q2. Enthalpy of sublimation of a substance is equal to
Answer : Option A
Explaination / Solution:
The process of sublimation involves the change of solid into vapour. Though in sublimation a solid does not pass through the liquid phase on its way to the gas phase, the enthalpy change is equal to the sum of enthalpy of fusion and enthalpy of vaporization because enthalpy is a state function.
Q3. When a gas phase atom in its ground state gains an electron. This is called
Answer : Option D
Explaination / Solution:
electron gain enthalpy is the energy released when an electron is gained by isolated gaseous atom to form isolated gaseous anion.
Q4. The magnetic field between the Horizontal poles of an electromagnet is uniform at any time, but its magnitude is increasing at the rate of 0.020 T/s.The area of a horizontal conducting loop in the magnetic field is 120cm2 , and the total circuit resistance, including the meter, is 5Ω. Induced emf and the induced current in the circuit are
Answer : Option D
Explaination / Solution:
e = Rate of change of magnetic field x area
=0.02×120×10−4=0.24mV
i=eR=0.245=0.48mA
Q5. Optical and radio telescopes are built on the ground, but X-ray Astronomy is possible only from satellites orbiting the earth because
Answer : Option D
Explaination / Solution:
No Explaination.
Q6. In certain parts of India, forests are burnt and the ash is mixed with the soil and the land used forcultivation leads to deforestation and this process is named as
Answer : Option D
Explaination / Solution:
Shifting cultivation is a kind of cultivation in which cultivating land is changed periodically. Forests are burnt and the ash is mixed with the soil and the land is used for cultivation of crop. This kind of cultivation causes deforestation.
Q7.
Maximum number of molecules of CH3I that can react with a molecule of CH3NH2 is
Answer : Option D
Explaination / Solution:
CH3NH2 can act as nucleophile to cause substitution reaction. (CH3)4N+ this is formed when 3 moles of CH3NH2 reacts with methyl halide.
Q8. A key-board has at least:
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. Oxidative phosphorylation is
Answer : Option C
Explaination / Solution:
Oxidative phosphorylation is process in which ATP is produced by chemiosmosis in inner wall of mitochondria called cristae.
Q10. If threshold wavelength for tungsten is 2300 , then energy of the electrons emitted by UV light of wavelength 1800 is
Answer : Option B
Explaination / Solution:
No Explaination.
