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271.
Choose the correct statement from following.
(1)Not all basic laws of physics are universal
(2)Conservation laws have a deep connection with symmetries of nature
(3)There are four to six fundamental forces in nature that govern the diverse phenomena of the world
(4)Physics can generate new technology but new physics cannot come out from technology
272.
What will be the projection of vector A=i^+j^+k^on vector B=i^+j^?
(1)2(i^+j^+k^)
(2)2(i^+j^+k^)
(3)2(i^+j^)
(4)(i^+j^)
273.
If velocity [V], time [T] and force [F] are chosen as the base quantities, the dimensions of the mass will be :
(1)[FT−1V−1]
(2)[FTV−1]
(3)[FT2V]
(4)[FVT−1]
274.
An expression of energy density is given by u=βαsin(ktαx), where α,βare constants, x is displacement, k is Boltzmann constant and t is the temperature. The dimensions of β will be :
(1)[ML2T−2θ−1]
(2)[M0L2T−2]
(3)[M°L°T°]
(4)[M°L2T°]
275.
Let ℓ, r, c and v represent inductance, resistance, capacitance and voltage, respectively. The dimension of rcvℓ in SI units will be :
(1)[LT2]
(2)[LA–2]
(3)[LTA]
(4)[A–1]
276.
(P+V2a)(V - b) = RT represents the equation of state of some gases. Where P is the pressure, V is the volume, T is the temperature and a, h, R are the constants. The physical quantity, which has dimensional formula as that of ab2, will be :
