Exchange of gases in the alveoli of lungs takes place through
Options
(a) osmosis (b) simple diffusion (c) active transport (d) passive transport
Correct Answer:
simple diffusion
Explanation:
No explanation available. Be the […]
A tuning fork vibrates with 2 beats in 0.04 second. The frequency of the fork is
Options
(a) 50 Hz (b) 100 Hz (c) 80 Hz (d) None of these
Correct Answer:
50 Hz
Function of a rectifier is
Options
(a) To convert ac into dc (b) To convert dc into ac (c) Both a and b (d) none of these
Correct Answer:
To convert ac into […]
Which of the following is a vector quantity?
Options
(a) Current density (b) Current (c) Wattless current (d) Power
Correct Answer:
Current density
Explanation:
No explanation available. Be the first to write the […]
In a uniform circular motion,
Options
(a) Velocity and acceleration remain constant (b) Kinetic energy remains constant (c) Speed and acceleration change (d) Only velocity changes, acceleration remains constant
Correct Answer:
Kinetic energy […]
The interatomic distances in H₂ and Cl molecules are 74 and 198 pm respectively. The bond length of HCl is
Options
(a) 124 pm (b) 248 pm (c) 272 pm (d) 136 pm
Which of the following compounds will gives positive test with Tollen’s reagent
Options
(a) Acetamide (b) Acetone (c) Acetic acid (d) Acetaldehyde
Correct Answer:
Acetaldehyde
Explanation:
No explanation available. Be the first to […]
If Na is heated in presence of air, it forms
Options
(a) Na₂CO (b) Na₂O₂ (c) Na₂O (d) both Na₂O₂ and Na₂O
Correct Answer:
both Na₂O₂ and Na₂O
Explanation:
No explanation available. Be […]
The maximum valency of an element with atomic number 7 is
Options
(a) 2 (b) 5 (c) 4 (d) 3
Correct Answer:
5
Explanation:
No explanation available. Be the first to write the […]
The hybridisation of carbons of C-C single bond of HC ≡C-CH =CH₂ is
Options
(a) sp³ – sp³ (b) sp – sp² (c) sp³ – sp (d) sp² – sp³
Correct Answer:
sp […]
2017 Copyright Doctor Dreams Training Academy