Which of the following physical quantities has neither dimensions nor unit
Options
(a) Angle (b) luminous intensity (c) coefficient of friction (d) current
Correct Answer:
coefficient of friction
Explanation:
No explanation available. Be […]
300j work is done in sliding a 2kg block up an inclined plane of height 10m.Taking g=10 ms⁻², work done against friction is
Options
(a) 200 j (b) 100 j (c) Zero (d) […]
If L and C denote inductance and capacitance,then the dimensions of L-C are
Options
(a) [M⁰L⁰T²] (b) [M²L⁰T²] (c) [M⁰L²T²] (d) [ML²T²]
Correct Answer:
[M⁰L⁰T²]
Explanation:
Dimensions of Inductance(L) = ML²T⁻²A⁻²
Dimensions of Capacitance(C) = M⁻¹L⁻²T⁴A²
A machine gun fires 10 bullets/s, each of mass 10g, the speed of each bullet is 20 cms⁻¹, then force of recoil is
Options
(a) 200 dyne (b) 2000 dyne (c) 20 dyne (d) […]
A body of mass 0.25 kg is projected with muzzle velocity 100 m/s from a tank of mass 100 kg.What is the velocity of the tank?
Options
(a) 5 m/s (b) 25 m/s […]
A particle has initial velocity(3i⃗ +4j⃗)and has acceleration (0.4i⃗ +0.3j⃗). It’s speed after 10s is:
Options
(a) 7 units (b) 7√2 units (c) 8.5 units (d) 10 units
Correct Answer:
7√2 units
Explanation:
No […]
With what minimum acceleration can a fireman slide down a rope while breaking strength of the rope is 2/3 of the weight?
Options
(a) 2/3 g (b) g (c) 1/3 g (d) Zero
A bullet loses 1/20 of its velocity after penetrating a plank.How many planks are required to stop the bullet
Options
(a) 6 (b) 9 (c) 11 (d) 13
Correct Answer:
9
Explanation:
No explanation […]
Van der waals,equation of state is(p+a/v²)(V-b)=nRT. The dimensions of a and b are
Options
(a) [ML³T²],[ML³T⁰] (b) [ML⁵T⁻²],[M⁰L³T⁰] (c) [M²LT²],[ML³T²] (d) [ML²T],[ML²T²]
Correct Answer:
[ML⁵T⁻²],[M⁰L³T⁰]
Explanation:
((p+a/v²)(V-b)) / nT =R
Since we have (p+a/v²), […]
An aeroplane flies 400m due to North and then 300m due to south and then flies 1200m upwards, the net displacement is
Options
(a) greater than 1200 m (b) less than 1200 m (c) […]
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