19.
out of the following, which is not emitted by radioactive substance?
A. Electrons
B. Electromagnetic radiations
C. Alpha particles
D. Neutrons
Answer & Explanation
Answer: Option D
Explanation:
No answer description available for this question. Let us discuss.
View Answer Workspace Report Discuss in Forum
20.
Sound waves in air are
A. transverse B. longitudinal
C. electromagnetic D. polarised
Answer & Explanation
Answer: Option B
Explanation:
No answer description available for this question. Let us discuss.
View Answer Workspace Report Discuss in Forum
21.
Magnetism at the centre of a bar magnet is
A. minimum B. maximum
C. zero D. minimum or maximum
Answer & Explanation
Answer: Option C
Explanation:
No answer description available for this question. Let us discuss.
View Answer Workspace Report Discuss in Forum
22.
It is more difficult to walk on a sandy road than on a concrete road because
A. sand is soft and concreter is hard
B. the friction between sand and feet is less than that between concrete and feet
C. the friction between sand and feet is more than that between concrete and feet
D. the sand is grainy but concrete is smooth
Answer & Explanation
Answer: Option B
Explanation:
No answer description available for this question. Let us discuss.
View Answer Workspace Report Discuss in Forum
23.
Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
A. 0.14 m/s
B. 140 m/s
C. 1.4 km/s
D. 14 m/s
Answer & Explanation
Answer: Option D
Explanation:
No answer description available for this question. Let us discuss.
View Answer Workspace Report Discuss in Forum
24.
Of the following properties of a wave, the one that is independent of the other is its
A. amplitude B. velocity
C. wavelength D. frequency
Answer & Explanation
Answer: Option A
Explanation:
No answer description available for this question.