A car accelerates from rest at constant rate for first 10s and covers a distance x. It covers a distance y in next 10s at the same acceleration.Which of the following is true?
Options […]
The displacement of particle is given by x=aₒ+(a₁t/2)-(a₂t²/3) what is acceleration?
Options
(a) 2a₂ / 3 (b) – 2a₂ / 3 (c) a₂ (d) Zero
Correct Answer:
– 2a₂ / 3
Explanation:
No explanation […]
The momentum of a body is increased by 20%.The percentage increases in kinetic energy is
Options
(a) 54 % (b) 44 % (c) 100 % (d) 50 %
Correct Answer:
44 %
Explanation:
Increase […]
The ratio of the dimensions of Planck’s constant and that of the moment of inertia is the dimensions of
Options
(a) frequency (b) velocity (c) angular momentum (d) time
Correct Answer:
frequency
Explanation:
The dimensional […]
What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?
Options
(a) 4 : 5 (b) 7 : 9 (c) 16 […]
The value of n so that vectors 2i+3j-2k, 5i+nj+k and -i+2j+3k may be coplanar,will be
Options
(a) 18 (b) 28 (c) 9 (d) 36
Correct Answer:
18
Explanation:
No explanation available. Be the first […]
If A=3i+4j and B=7i+24j the vector having the same magnitude as B and parallel to A is
Options
(a) 5i+20j (b) 15i+10j (c) 20i+15j (d) 15i+20j
Correct Answer:
15i+20j
Explanation:
No explanation available. Be […]
The distance travelled by a particle starting from rest and moving with an acceleration (4/3)ms⁻², in the 3rd second is
Options
(a) 6 m (b) 4 m (c) 10/3 m (d) 19/3 m
Correct […]
A particle has initial velocity (2i⃗+3j⃗) and acceleration (0.3i⃗+0.2j⃗). The magnitude of velocity after 10 seconds will be:
Options
(a) 9 √2 units (b) 5 √2 units (c) 5 units (d) 9 units
Correct […]
If force(F),velocity(v) and time(T) are taken as fundamental units, then the dimensions of mass are
Options
(a) [FvT⁻¹] (b) [FvT⁻²] (c) [Fv⁻¹T⁻¹] (d) [Fv⁻¹T]
Correct Answer:
[Fv⁻¹T]
Explanation:
Force = Mass x Acceleration
F […]
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